4l60e boost valve symptoms

 

A simple visual check of the valve and its movement within the bore can reveal signs of obvious outboard wear. The low reverse clutch packs were burnt up. Oftentimes, increasing line pressure is a requirement when increasing driveline output. 4L60E 4L65E 4L70E, 77754-41 Transmission Shift Valve, Heavy Duty 2-3 Trans Shift Valve Black. See More Specifications | Check the Fit. January 01, 2013. As a further effort to improve fuel economy and prolong the life of transmission and engine components, PWM control evolved into EC3. Sep 30, 2005 · Sonnax Sure Cure kit SC-4T65E, fully compatible with all GM 4T65-E units, is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. When wear is significant, oil leaks past the valve preventing it from properly stroking the converter clutch apply valve into the release position, leading to engine stalls and converter overheat. Sep 8, 2023 · Replace any faulty parts. February 28, 2009. 0025 - Slide to pump body deck: . I ALWAYS replace the sun shell with a "Beast" sun shell on a 700 or 4L60E build. 490" ratio and has the o-rings. In GM 4L60-E, 4L65-E and 4L70-E units, severe wear of the TCC regulator valve bore caused by oscillation of the OE valve allows regulated converter apply pressure to exhaust. 810 (short) Bushing & Valve. Vehicles with a 4L60-E transmission frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure Mar 23, 2007 · Depending on how late model 4L60E you have the early design valves will not fit with out machine work. 43. Shifting is inaccurate or delayed Dec 26, 2011 · Poor line pressure rise due to a leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Frequent, proper vacuum testing can put money in the bank, improve turnaround time in your bays, and prevent costly comebacks. The discs are too thin to put up with the heat of a 2-3 shift under load, plus the cheesy, thin Superior 4L60E Shift Correction Kit W/ Boost Valve. Solution – In order to repair this transmission problem, the 2-3 shift valve, 2-3 shuttle valve, and the valve bore Learn more about how the 4L60E Pressure Regulator Valve (aka PR Valve) works. Now I have been searching for the past couple of days on the different effects of boost valves and their sizes. 420") reverse boost valves are available that provide a moderate increase in pressure, and are a good addition to any 4L60E. Stabilizing pressure starts with precise valve-to-bore clearances (PR valve bore wear is common in 4L60/E units) and a quality, leak-free boost valve. This is by far the most common problem with the 4L60E transmission; gear slippage. 471" dia. E. Have my tranny pan dropped for a cracked 1-2 accumulator repair and thought I'd take a look at a few of the valves. This valve body kit fixes Bind up in reverse Low and reverse clutch burn up Delayed engagement in forward and reverse Slide in 2nd 3-4 clutch burn up More lube oil Clutch and band failure Code 1870/converter burn-up New . PATREON: https://www. I won't run an Alto 3-4 stack in anything, especially in a towing application. Dec 18, 2013 · 4L60E Boost Valve Recommendations. While 4l60e shift solenoids do go bad, it’s not a common occurrence. If Original Boost bushing type was: Short – re-use Original PR spring. The valves and solenoids remain (virtually) the same as with PWM operation, but the control strategy and TCC lining have again undergone changes. 500 boost valve (all brand new). I have a 4l60e out of a 2004 GTO and bought Transgo's HD2 kit. Sonnax boost valve kit 77898E-6K is a large OE ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. Transgo HD2-C kit fixes first two without removing trans. If base pressure is low, trans or pump is worn out. The only thing is a very slight flare between 2nd and 3rd. Optional parts at additional cost depending on what your valvebody needs: Accumulator valve: Sonnax 77777M-K; AFL valve: 77754-09K Description. I put in a boost valve, corvette servo, and Sonnax Pinless accumulators. GM 4L60E Boost Valve and Sleeve This Boost Valve and Sleeve Kit from Superior will improve all 4L60E Transmissions. e. If you have a problem with only one scenario (example: Park –> Reverse), try to limit the amount of times Jun 14, 2009 · 6-outer boost PR spring. The Fix. $24. Back again. I dropped pan and removed valve body with tranny in truck on a 4L60E from a 93 Suburban. 740", and for the short boost assembly is 4. Booster Valve- A bad booster valve can leave you without reverse in a hurry. 110 for the 3rd. Installing Sonnax pressure regulator valve kit 104520-14K restores the hydraulic integrity of these circuits for proper line pressure control in all ranges. 490" versus the stock 0. 470"/E-4K). Hard Second Gear – The third most common symptom of a failing 4L60E transmission is the difficulty in shifting to the second gear. Installation: Transmission Removal Required. It seems the new build is making much better use of pressure than stock setup. Failure in the closed position. Hardcoat anodized aluminum regulator Sonnax TV boost valve kits 77917-02K (. 64" torque converter) or 11. Sonnax HD 2-3 Shift Valve. Sonnax boost valve kit 77898E-14K is a standard OE ratio assembly that will restore hydraulic integrity and prevent leakage in units with late-style pumps. 64″ torque converter) or 11. Includes: USA-made hardened steel boost valve and bushing. The distance for the long boost assembly is 4. A new pressure regulator valve outer spring is also included The 4L60E Transmission has went through many changes/improvements over the years since it first came out in 1982. 1999 4L60e Small Shaft with NO REVERSE what happened!? Oh man i don’t even know where to start!!! First thing WHOEVER sent us the Milwaukee 3/8 bushless impa Dec 9, 2020 · Usually, the vehicle speed and load are the main determinants of what target gear and line pressure should be used in MegaShift 4L60E control strategies. Second gear is 77911-03k. It requires 8. Learn how the 4L60E EPC Solenoid creates the Torque Signal oil pressure, and h Sep 30, 2005 · In VW/Audi 01M, 01N and 01P transmissions, the TCC boost valve wears the inside diameter of the sleeve due to constant valve oscillation. Using the Sonnax Torlon *****. Aug 15, 2010 · 16. Valve Body Xpress. 643". Reassemble the valve body and reinstall it in the transmission. 4 quarts (11. Jun 6, 2018 · Sonnax Sure Cure kit SC-4L60E is a comprehensive reconditioning package for GM 4L60-E, 4L65-E and 4L70-E PWM units featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Sun Shell- A broken sun shell will cause the 4L60E to lose reverse. For 2005, GM changed the design (late pump). inner boost valve goes inside the boost sleeve. 2hours or less and my truck runs and drives like new. Sonnax boost valve kit 77898E-3K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. , OE ratio, factory style Boost Valve Kit 77898E-4K Early style, . Symptoms Of Bad 4l60e Shift Solenoids. IF they are spread out the sun shell needs to be replaced. 490" in diameter. 16. The 2-3 shuttle valve which is directly behind the B solenoid came right out while the Jan 21, 2013 · The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise. Jan 11, 2016 · It was obvious once I removed the pan what the problem was. Remember to exercise caution and refer Mar 13, 2009 · 1095 posts · Joined 2007. A worn OE pressure regulator valve can be detected in two ways. Boost Valve and Bushing, . So I had ordered a vette servo for my 4L60E, and the same ebay auction I won came with a . Sonnax Transmission Company 2 Imtec Lane, Bellows Falls, VT 05101-0440, USA. The incorrect 1-2 accumulator valve or servo piston ratio can also create undesired 1-2, 2-1 shift feel. Learn how the 4L60E Pressure Regulator Valve (aka PR Valve) works. See how easy it is to master vacuum testing and work with 4L60. 470" dia. Identifies symptoms and recommended solutions for quality rebuilds. Problem – Drivers may experience the loss of 3rd and 4th gear, erratic shifting, slipping, freewheeling above 30 mph and a P0757 DTC. This will cause the engine to stall when the vehicle comes to a stop. The unit was used in dozens of Chevy/GMC light-duty, RWD passenger cars and pickup/SUVs/vans including the Impala, Blazer, Jimmy, Suburban and S-10. You’ll need to replace the TCC valve regulator to fix this issue. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding. When the valve came out, fluid leaked back into the pan. This closely tolerance valve and sleeve kit restore hydraulic integrity and prevent leakage. Refill the transmission with the recommended fluid and verify proper shifting. patreon. 490" dia. aluminum valves and is made of hardened steel to resist wear. 423" dia. 490" Elevated Pressure Regulator Spring High RPM Pump Slide Spring Spacer Servo Parts 4th Servo Return Spring Servo Cushion Spring Servo Piston D-Ring Kit Case Parts 3-4 Accumulator Piston Kit 3-4 Accumulator Spring Servo Release Check Valve Valve Body Parts Forward Mar 21, 2013 · dummy. All my changes are in performance pattern. 470" or 0. Sonnax (and there may be others) makes a boost valve that is . This kit also increases accumula- Dec 8, 2005 · R&R = Remove & Repair (or Rebuild) = Transmission must be removed to fix the problem and may have to be rebuilt or replaced. The "E" RWD trannys respond quickly to shift mods. Mar 2, 2016 · Pressure pulsation from poor PR valve control is the real danger, and a sure sign of this problem is gauge needle-bounce when testing line pressure. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints as well as other Nov 11, 2006 · The rubbing sounds could be the sun shell rubbing the case. The valve and sleeve can be replaced easily during a routine service of the transmission for around $50. The kit includes valve body, servo, pump and accumulator components and modifications designed to deliver increased durability while providing short smooth shifts as well as a more efficient TCC apply. Learn how the 4L60E line pressure is created. tran Jan 21, 2013 · The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise. Bob Warnke. Fits all years & ’98-later EC3 units. (2) Springs. Monster Sale Price: 98. May 16, 2006. 5L40/50-E Solenoid Identification. See how easy it is to master vacuum testing and work with Symptoms: Poor line pressure rise due to leaking boost valve, clogged Electronic Pressure Control EPC filter screen, failing Electronic Pressure Control (EPC solenoid), or worst case leaky seals throughout. Looking at a fluid schematic, it appears that line pressure is always delivered to the boost valve, but blocked until needed. 471 for higher boost capacity and proper tolerance is assured at bore mating surfaces. If max pressure is low, check EPC solenoid. Burnt band and 3-4 frictions' These are typical symptoms of outboard PR bore wear. Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. Contact Us. 490"/77898E-K, -7K) valves were designed to result in a slight/moderate boost in line pressure at mid-range (over the . A 4L60E transmission experiencing this issue will feel like it has a shift kit installed. 17. Someone recently asked me about which is the best boost valve to get. Two problems & questions. These are commonly referred to as “garage shifts”. Sound like the PWM further modifies the oil pressure from the TCC valve. 472IN Boost valve to increase line pressure fits all 93-UP EXCEPT HYBRID UNITS ". Spacer. 500. 002-. Here's a screenshot of my HPTuners stock tune. Factory Replacement . Jan 1, 2013 · GM 5L40-E, 5L50-E Valve Body Layout. I assume I can access that via the tow haul button on my truck? I dialed back 1->2 and 2->3 upshift pressures by 19%. Also reduces 3-4 clutch failure, band failure and Low reverse clutch slip. The car is unable to shift properly into some gears, like reverse. Jan 21, 2013 · The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise. 472” factory replacement boost valve and bushing kit fits both early long and late short style boost valve systems. Mar 2, 2016 · In 4L60-E, 4L65-E and 4L70-E units, it’s crucial to prevent even minor leaks in the 3rd accumulator checkball assembly. 75. MAKE sure the retainer snap ring is in the actuall groove for it to be installed into. Aug 3, 2023 · Sonnax LB4L60E boost valve kit: Install in place of worn out factory boost valve and sleeve: Machining Services: Pump body and cover resurfacing and milling (pump body only) Provide machinist your pump rotor and slide - these are selective and clearance must be as follows: - Rotor to pump body deck: . 471 as your boost valve size and skip steps 1 and 2. Feb 5, 2016 · Agree on the boost valve - I use the Sonnax boost valve with its O-rings. The 4L60E transmission weighs 146 pounds dry, and 162 wet. So to test this, I would get it to about 45-50 MPH with the gear selector in 3rd, or at 55-60 in 4th just to be safe. ), 77917-03K (. May 20, 2009 · 4l60E Slow Reverse. Installing this kit will fix most pressure rise problems. Replaces both the Early 1. 003" maximum clearance The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise. 4L60E Lost All Gears Total loss of fluid or pump failure could be the cause of 4l60e transmission problems. 002" minimum and . 81″ torque converter) of transmission fluid, Top 30 Common 4L60E Transmission Problems and Repair. This Problem Solver replaces the worn out O. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints as well as Jul 9, 2023 · The 4L60E will lock in 3rd and 4th, you could try both gears. Follow these steps to Rebuild a 4L60E Automatic Transmission: Dismantle the transmission unit; detach the rear seal from the extension shell. Special Instructions: Up to March 2005 installs without transmission removal. . May 21, 2012 · Oversized (0. Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. , Aug 16, 2023 · Sonnax . Generally, it wears out coherently, causing the converter clutch to slip. 4L60E 2-3 shift valve stuck. , Sonnax LB4L60E boost valve kit: Install in place of worn out factory boost valve and sleeve: Machining Services: Pump body and cover resurfacing and milling (pump body only) Provide machinist your pump rotor and slide - these are selective and clearance must be as follows: - Rotor to pump body deck: . Drop-in Zip Valve™ parts install quickly and easily. It's a $45 part and well worth the peace of mind. When assessing a shift solenoid issue, there can be a number of things to consider. 910 (long) & Late 1. 472 Boost Valve" Fits both early long and later model short type Boost Valve assembly. 4L60/65E Valve kit, TV, 93-UP Boost Valve & Sleeve 0. Also, it won't lock unless you have your foot on the gas and are under a slight load. whining, grinding, or screeching. Sonnax boost vavle kit 34200-03K eliminates these problems. 500 in. Take out of the output shaft, the output speed sensor, the extension housing, and the yoke seal. 4. GM sent out several TSB (Technical Service Bulletin) on this issue. Mar 18, 2011 · The 4L60E transmission weighs 146 pounds dry, and 162 wet. Inside the valve body, you can find the TCC regulator. I did a rebuild kit on 1995 GMC K1500 because of slow/weak reverse. 500" boost valve (easy fix in pan). After rebuild we still had same reverse issues so we took it apart and put in new spacer plate and different 2-4 band. Dec 9, 2014 · 4L60-E PWM Application Sample. It was my last resort before a rebuild as my trans slipped bad, had really harsh 1-2 shift, and no lockup. 500 Boost Valve Kit. In bone stock OE applications, I have received complaints of too firm of shifts with a larger boost valve in the pump. 800-843-2600 · 802-463-9722. dummy. When a torque converter clutch solenoid fails in the closed position, it means that the torque converter clutch will be engaged at all times. This site explained all of my symptoms and said this valve body would fix this really common issue. 500 boost valve: O-rings/4L60E uses a different kit, part number LB-4L60E: Transgo: Billet pump rotor (10 and 13 vane versions available from CK Performance) TCI: Sonnax Smart Shell (recommended for anything beyond 350 HP) TCI Beast Sun Shell: Sonnax Factory Forward Drum Reinforcement kit w/billet coast clutch piston : Good for up to 450 HP Sep 20, 2023 · One of the most common signs you have a problem with your transmission valve body is a delay (2 or more seconds) or harsh shift when shifting from Park to Drive or Park to Reverse. Each layout: Displays an exploded view location guide for individual valve trains. No need to stock. If the valve body ends up warped, or if the gasket fails, it’s entirely possible that the gear won’t engage. I know there have been some wear issues with valve bores on these transmissions, but reverse had no issues prior to the shell gear failure. 00. May 4, 2018 · Valve Body Issues- A bad valve body can make the reverse gear not work in the 4L60E. No need to stock both types anymore! Restores pressure rise and protects transmission from extreme reverse pressure due to worn out / cross-leaking boost bushings. This problem typically occurs when your TCC regulator valve wears out. Didn't notice a difference. Seal restorer may fix last problem, but probably R&R. retainer installs into groove. Part Number: TRG-4L60E-BOOST. 490 EPC spool diameter) with O-rings and 77898E-3K is a factory style sleeve. Snap ring. He Sep 2, 2020 · Though the shell is supposed to be one piece, not only can it break off, but it can also strip out the splines. 4L60E / 4L65E / 4L70E TCC Regulator & Isolator Valve Kit, Sonnax 77754-04K. 4L60E OE diameter . 5L40E/5L50-E: Isolating Concerns Re: Loss of Reverse or TCC. PR valve goes in first. Voedsephobia is the fear of garbage Feb 13, 2023 · *TG drop in pressure regulator valve 4L60E-PR in the pump, along with a 4L60E-BOOST boost valve kit *Use unbreakable pump rings and spring, TG 700 PKH For use above 5400 RPM *13 vane slide, new 10 vane rotor (match thickness), new vanes, . No forward movement in OD or D, but L2, L1, and R work: The forward sprag is broken. 490" increased boost ratio sizes. 2. 4L60E New Sonnax 77898E-K Reverse Boost Valve And Sleeve Kit 1993 Thru 2004. 1) I kept 7 check balls in valve body, no problem. By following this step-by-step guide, you can effectively diagnose and resolve the 2-3 shift valve stuck issue in your 4L60E transmission. 4L60E, 4L65E, 4L70E Drop-in Pressure Regulator Valve. However, in heavier throttle conditions, the 4L60-E accumulator valve designs provide a noticeably firmer shift . I did some digging, and for the '94-96 B-cars, get the Sonnax 4L60E-LB1 boost valve kit. 0015-. GM Solution – Replace the 4L60E valve body with revised TCC regulator and isolator valves. Sleeve manufactured from highly wear-resistant aluminum. 4 quarts (9. Below is a list of common transmission problems with the GM 4L60E Transmission and possible solutions to repair. I have read that some shift kits come with . 500 boost valve (note, 04 is different than 05-06) And an elevated pressure spring part number 77722-01k 2-4 servo: use the sonnax billet super hold. Mar 2, 2016 · The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise. 4th gear is 77767k. Hardened steel boost valve with over 20% wider spools to provide better durability and increased sealing contact area. Sonnax boost valve kit 77898E-K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. I've tried and tried to delicately push it up in it's space and it will not go past a certain point. Jan 21, 2013 · A worn OE pressure regulator valve can be detected in two ways. #1 · Jan 18, 2015. Assembly parts included: New valvebody gaskets; New filter (stock or truck depth (+$5)) New pan gasket. I use a . Jan 21, 2013 · GM 4L60-E Vacuum Test Guide. It includes components as well as modifications that recalibrates the entire accumulation system. Boost valve spools have annular grooves to reduce side-loading that causes wear. I found a broken spring in the 3-4 accumulator. As well, the pressure regulator valve (located under the reverse boost valve) should have two small 'flats' (~3/16" wide) ground on the second land - counting the lands from Dec 12, 2014 · Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0. Reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit 77754-04K restores normal TCC operation by restablishing the hydraulic integrity of this circuit. Feb 26, 2019 · Concerns with a 1-2 or 2-1 shift feel could be the result of wear at the accumulator valve, 1-2 accumulator piston, servo assembly or pin-to-case wear. open end installs into pump body. Vacuum testing is an efficient way to identify the root cause of transmission problems and evaluate the effectiveness of repairs. GM May 19, 2006 · Maura Stafford. The second is so hard that it almost feels like a shift kit has been installed. No worries! Feb 21, 2013 · GM 4L80-E Vacuum Test Guide. TCI's new 4L60E boost valve assemblies provide you the means of elevating your Feb 21, 2024 · For '94-95 valvebodies, modify the manual valve to cure the lo-reverse design defect, eliminating reverse failure. Many major repairs of the 4L60E at around 50,000 plus miles are because of the boost valve and sleeve. Common failures on 4L60E, symptom -> cause -> any possible repair: 1. After March 2005 an Input Speed Sensor was added which requires transmission removal for Mar 25, 2009 · 4L60E trannys through 2004 use an early pump design. ) and 77917-04K (. It comes with a longer servo pin that has seals on it. The regulated PWM converter apply circuits are not routed oil from the pressure regulator valve as in "the good ole'days. ACDelco GM Original Equipment 24215111 Automatic Transmission Manual Valve Position Pressure Switch. 003 Sep 30, 2005 · Excess wear at the isolator valve bore reduces TCC apply pressure. In this video we take a closer look at the Boost Valve and Sleeve. The second is vehicle symptoms such as clutch slippage, reverse chatter and 3-4 clutch failure. Everything seemed fine until I tried to remove the 2-3 shift valve out of it's bore. F-350 DRW Diesel w/5th wheel RV. Mar 10, 2020 · How I free it up. The valve and sleeve can be replaced easily during a routine service of the transmission at an additional cost of around $50. May 23, 2018 · Pump. Oct 7, 2018 · I spent some time reviewing GM Performance Forum and some of this goes back to 2001 - 2003, but the change to 4l60E (Electronic Control) in 1993 did create some issues with the method of TCC apply and symptoms such as yours was common. If you have a pump cover that is missing the boost sleeve it is possible to verify which length sleeve belongs in the bore by measuring from the very inner point of the main pressure regulator valve bore to the inner edge of the retaining ring groove. , 236 psi Forward Pressure, Small/Big Blocks, 4L60E, Kit. Increases pressure rise response for use in Trucks, police, taxis, delivery and Hi-performance. The o-rings do make it tougher to install but it's the only way to stop the leakage inherent in the OE Apr 29, 2024 · Find TCI 4L60E Boost Valve Assemblies and get Free Shipping on Orders Over $109 at Summit Racing! Operating line pressure is the lifeblood of any automatic transmission by providing the clamping force on the clutches and bands. 500" dia. TransGo Automatic Transmission Boost Valves. We learn how the tran Learn how the 4L60E Pressure Regulator Valve (aka PR Valve) works. Transmission Slipping. If your transmission is slipping, you might notice symptoms such as: Unpleasant metallic noises; i. Jan 18, 2015 · 137 posts · Joined 2003. This is a primary cause for TCC-related GM. Sonnax Transmission parts for GM 4T60 applications. 472 Boost Valve Kit. From the factory this is a huge leakage area and this pin addresses that. 46-MOD 4L60E Vacuum System Installation X Pan rail 7/16" 7/16" READ THIS: If you are unable to install the boost bushing parts due to interference with the late model speed sensor harness, use . Fits both Early Long AND Late Short Style boost valve systems. Damage can occur when wear in the boost sleeve causes insufficient line pressure in reverse. 2 check balls fell when I removed the separator plate from case. Our drop-in valve addresses this number one complaint. To replace the TCC Dec 8, 2016 · Received my valve body two days ago. Produced from 1982 to 1993, the GM 4L60 is a 4-speed, hydraulically-controlled transmission known as the Turbo Hydramatic 700-R4 until a name change in 1989. 5L40/50-E Valve Body Identification. For V6 applications and smaller vehicles, use Sonnax TV boost valve kit 77917-02K. Feb 21, 2013 · High line pressure and buzz is created by oil leakage past the aluminum balance plug. Everything went in fine except the boost valve. , OE ratio, O-ring style Boost Valve Kit 77898E-3K Early style, . 474 boost valve included to replace worn OE valve. Transgo HD2-C kit fixes first two without removing Transmission. If you work through signal and apply circuits you will see this. The clip came off the boost valve and the valve was hanging almost all the way out. inner - outer springs next. From bells to valve bodies, added solenoids, changes in pump and convertors. Common issues that may cause you to believe the 1-2 or 2-3 shift solenoids are failing are a bad accumulator, stuck shift valve, just to name a few. Sonnax has developed two reverse boost valve and sleeve kits, 77898E-K for oversized (. com/CurmudgeonTransmissionSupplier Links:Superior: https://superiortransmission. The seal restorer may fix the last problem but probably remove and rebuild if needed. High Performance . Lost or damaged component AFL Valve End Plug 77754-39 5/Bag 3-4 Clutch failure, 2-4 Band failure, Low line rise, Poor shift quality Boost Valve Kit 77898E-6K Early style, . Leakage at the hidden #7 checkball (Figure 1) reduces 3‐4 clutch apply pressure, a direct cause of burnt 3‐4 clutches. "The Sonnax oversized (. The sun shell tangs get spread out from being driven by the reverse input drum. These two factors can have an immense impact on how well the transmission functions, as they determine things such as shift points, shift quality, fuel economy, and overall performance. com/Transtar: https://www. That means it will feel like you need to apply more force when shifting into second gear. Aug 12, 2001 · We are seeing too many major repairs of the 4L60E at around 50,000 plus miles being traced to this boost valve and sleeve. 003 The valve body bolt needs to be removed then you can lift the body and flip it over. The first is a dynamometer test that reveals low line pressure during boost conditions (look for 50-100 psi less than specified in Reverse). Need a replacement transmission? Oct 2, 2021 · Received 13 Likes on 8 Posts. The valve boost diameter is set at . Get familiar with the 4L60E Boost Valve. 093 for the 2nd feed hole and around . Symptoms of a bad TCC solenoid. The 4L60-E transmission basically kept the same transmission architecture as the 4L60 Mar 8, 2023 · Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches. This one is the . Use GM special tools to loosen the bolts holding the oil pump to avoid damaging the pump case. IIRC, I have . I tried it without the springs and regulator valve to see if that might be holding it Mar 6, 2024 · 1. ) eliminate these problems in a variety of applications. Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. 81" torque HP-4L60E-01 Fits '94-later units Pump Parts Boost Valve with O-Ring, . #1 · Mar 13, 2009. I dropped the pan and have inspected the reverse boost valve, 1-2 valve, 2-3 valve and the converter clutch valve. I just put it back together again last night and now I have great shifting from 2 4L60E 1993-On SHIFT KIT Valve Body Repair Kit. 490 and then theres the . The 4L60E pwm oil circuits are not correctly illustrated. A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. In Stock (more than 10 available) Oct 19, 2021 · By comparing the firmer 700-R4 codes (B, M, L) with the 4L60-E codes, it is noted that at lighter throttle the overall pressure and shift firmness is relatively equal. Sonnax 77898E-K 4L60E REVERSE BOOST VALVE KIT. Feb 16, 2022 · 16. Sep 24, 2010 · Early style. GM's correction was to bore out the valve . Mar 21, 2008 · All forward gears work fine. Transmission. Sonnaflow® Chart 5L40E (Normal) September 16, 2005. These kits valves are in . Figure 3 – Later 4L60-E Series Accumulator Valve Pressure Curves. zi el as vt aa ff mr uj zx xw