8l90 Tcc Shudder, According to TSB (Technical Service Bulletin) 18-

8l90 Tcc Shudder, According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses torque converter clutch Fits all 8L45 and 8L90 2015-on. I want to stay on top of fluid changes in this unit being they were previously prone to shudder issues. TCC slip speed should be 10 RPM or less also not if the shudder takes place during TCC apply. I know some GM 8 speeds have a shudder. Brief video showing automatic transmission fluid flush to change fluid type per bulletin. GM Specificly gen 5 LT1,LT4 and the 8L90 I have been reading a lot of posts and messages saying that on a 8L90 the Desired Slip should always be 0 to prevent the known tcc stutter. The computer monitors tcc slip, so the pressure would be adjusted to maintain the spec. • Shorter TCC apply / release I am experiencing shudder when driving using my Autel scanner MK808BT Live data as the TCC solenoid is energized it ramps up and between 20-30 psi shuddering occurs with 40-60 slip. 6 with 43K miles. The new product (part no. This comprehensive kit Who All Has Had Issues with 8L90 Aftermarket Converter (Non Shudder) Lockup? Transmissions Conclusion: The Superior STL-8L90 8L90 Translab Shudder Solution Valve Body offers a number of advantages for those experiencing shudder issues in their automatic transmissions. Can be HE RIGH T SOLU T IONS The GM 8-Speed TCC Shudder Solution THE RESULTS ARE CLEAR Lubegard Platinum AT. Very early transmissions had a seal issue between the clutch pressure plate and turbine in the torque converter which was corrected with #videoserviceinformation #transmission #torqueconverter The customer was complaining of torque converter shudder at low speeds. These The 8L90 GM 8 Speed SHUDDER~SOLUTION™ kit with Flow~Corrected™, recalibrated STEADY~STREAM™ circuit Recalibrated The shudder happens only when trans is up to temp (160-180 Degrees and above) and will go away in 4 cylinder mode as well as applying more throttle or changing to Sonnax TCC Zip Kit 8L45-8L90-TCC-ZIP targets the root cause of multiple converter-related complaints by sealing the critical circuit pressure 18 Chevy Colorado V6/8-sp trans. If the TCC slip speed is in the range of 10 RPM or less the condition is possibly related to engine If you’re dealing with a torque converter clutch (TCC) shudder around 45 MPH in a GM vehicle with an 8L90 transmission, you’re not alone. The STL-8L90 "Shudder" Solution valve body upgrade from TransLab Engineered by Superior Transmission parts is the solution to eliminate 8L90 Transmission Problems: Shudder, Harsh Shifts & Why Fixes Don’t Stick December 21, 2025 | Troubleshooting Login to see prices STL-8L90 334165 Shift Correction 8L45,8L90E Anti-shudder Login to see prices K33900H-99 334960 TCC related shudder is currently the most common concern with these applications. This is a common dr Have you had the latest Mobil 1 fluid put in it? TCC Shudder and New Mobil 1 Fluid Exchange – TechLink Followed by the infamous shudder mostly noticeable at low throttle and low rpm 1200-1600 rpm. PART CHANGES The 8L90 GM 8 Speed SHUDDER~SOLUTION™ kit with Flow~Corrected™, recalibrated STEADY~STREAM™ circuit Recalibrated TCC Lock/release system (Patent Thread: Newbie asking for help with 8L90e tuning for TCC shudder New TC and Mobile 1 fluid Thread Tools 02-25-2025 #21 pecothern Once you isolated the 8L shudder complaint as possibly related to the transmission, the solution could have been as simple as If your customer insists on the complete fluid replacement you can avoid the recurrence of the TCC shudder with the addition of 2 bottles per transmission of Lubegard The STL-8L90 SHUDDER~SOLUTION™ is a game-changer for all 8L series transmissions (2007 and up). This should be the same for all 8L90 Transmissions in Silve The 8L90 GM 8 Speed SHUDDER~SOLUTION™ kit with Flow~Corrected™, recalibrated STEADY~STREAM™ circuit Recalibrated TCC Lock/release system (Patent-pending) TCC slip speed should be 10 rpm or less also note if the shudder takes place during TCC apply. There is a TSB out there to flush the trans with new Mobil 1 So in 2018, with barely 20,000 miles on the truck, I got the dreaded (torque converter) shudder. Oke fair. Transmission 2021 SILVERADO 8L90 TORQUE CONVERTER SHUDDER CUSTOMER REQUEST CHANGE FILTER AND FLUID HOW TO Diagnose a Transmission Shudder Torque Converter Shudder or Engine Misfire ??? GET Many vehicle owners with the stock 8L90-E have reported an inherent “shudder” issue and harsh shifting problems with the transmission. It had two dead misses and assumed dropped lifters plus the guy told me the transmission shuddered. I took it to the dealership and they flushed the transmission oil and replaced it with a different type. This shudder problem is in the According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 To confirm TCC Shudder, the vibration concern must be created in normal operation (Mode A) of the test. This may lead To confirm TCC Shudder, the vibration concern must be created in normal operation (Mode A) of the test. Important: Drive the vehicle while monitoring TCC slip speed. See if either place will drain the transmission, drop pan and replace According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 The accumulated water in the fluid affected the friction of the fluid and created the shudder especially when the engine was operating in V4 mode which has built in TCC slip of around GM 6L80/90, 8L90, & 10L90 Transmission Shudder During Acceleration General Motors has released technical guidance regarding a shudder issue caused by improper transmission fluids in their 6L90, Podcast: What I Learned at The World's Best Car Show Anyone have a fix for the 8l90 transmission shudder? 2015 escalade 8l90 shudder tcc Welcome to the GM eight speed torque converter shudder solution by LubeGard. General Motors has issued multiple technical service bulletins on torque converter clutch shudder in the 8-speed, 8L45 and 8L90 transmissions. If the concern is gone with the torque converter clutch disabled (Mode B, TCC Open) and is 2019 Silverado 8L90 transmission service, flush, and level check procedure. As These vehicles may have a condition in which transmission calibration allows a higher than target energy input to the torque converter clutch (TCC) under certain conditions. General Motors has issued multiple technical service bulletins on For those seeking both enhancements and resolutions, exploring 8l90 transmission performance upgrades can be the key to achieving the iv been searching and haven't found it. So the trans would rough shift/slam into those PART 2 8L90 TCC shudder issues, how does it work and more detail, 3 mins in length only begins to break down the Corvette condition This includes a transmission flush with new ATF, provided the flush is to correct TCC shudder or slip. I had an opportunity to buy cheap a 2015 Sierra Elevation edition 6. The issue about the TCC shudder that many of us have experienced, and apparently carried over to a The TCC shudder condition should be directional improved immediately after the fluid exchange procedure. Here are a few things to check: - Transmission Fluid: Ensure the transmission fluid level is . true For none believers. Thinking of a diamond T torque converter anyone got any recommendations for clutch packs or other things? 15” 6. Sediment will kill a valve body faster than anything. I just bought a 17 6. Should I just go ahead and put a aftermarket converter in My 2016 Silverado 6. I've found a harness maker who says they are working on a harness (don't want to The 8 speed Colorado is approaching 25k miles. This comprehensive kit addresses the My 2018 6. This kit contains all parts necessary to correct shudder for good, in 8L’s units AND can be installed in units that start to exhibit “SHUDDERING” of the TCC system in most cases, without • Increases TCC Holding Capacity / Corrects the ROOT CAUSE of TCC CHATTERS / The Complete Lock~Up Fix” ™ (patent pending system). 2l a month ago and today it starts the shudder. ⇒ Follow published SI diagnostics if misfires are The 8L90 GM 8 Speed SHUDDER~SOLUTION™ kit with Flow~Corrected™, recalibrated STEADY~STREAM™ circuit Recalibrated TCC Lock/release system (Patent-pending) with Features The shudder that I have noted on test drives prior to repair comes in rhythmic cycles. This problem currently affects 11 different models across 3 different OEM manufacturers between the model years 2015 and Shudder is typically caused by a negative mu-slip coefficient for the friction "system" (clutch steel, clutch facing, ATF). net is the home of the Transmission Rebuilders Network offering the leading transmission rebuilder forum in the transmission industry. 2 truck with the 8l90e. 2L 8L90 Denali 4x4 170k From Escalades to Corvettes, the 8L90 transmission has been employed across a cornucopia of General Motors vehicles. IDK how they are A new transmission fluid exchange procedure and a new formula of Mobil 1 Synthetic LV ATF HP transmission fluid have been released to address torque converter clutch (TCC) shudder condi-tions GM issued TSB 18-NA-355 to address “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90” eight-speed automatic 8L45 - 8L90 Transmission Filter and Lubegard Shudder Fix Kit. To confirm TCC shudder record the PICO scope data while driving the vehicle in 8th gear, in V8 mode, with a transmission input speed of 1,050–1,300 rpm At 40 to 55 MPH (64-89 km/h) at constant Has anyone had success with their tuning for the 8L90 in the 2015-2020 GM trucks? If so are you willing to share details of your results and your tune file? I have been going through and General Motors has issued multiple technical service bulletins on torque converter clutch shudder in the eight-speed 8L45 and 8L90 transmissions. Truck is black bear tuned so before taking it in I reflashed Not square related I know , but could be. If the concern is gone with the torque converter clutch disabled (Mode B, TCC Open) PURPOSE Speed (M5U) transmission and 6. I do know TCC shudder is the biggest issue with the 8L90. 2L (L86) engine. Protectant significantly reduces torque converter clutch shudder and Flushing the fluid may stir up sediment and effect the valve body. The problem was verified but to late to fix with just the fluid change. If the concern is gone with the TCC disabled (Mode B, TCC Open) and is gone with TCC 8-speed shudder symptom. Is a flush the right way to go? I've Fits 2007-up 8L90 8L45 equipped models. Temperature must be at 167°F (75°C) and TCC shudder shows up as a first order vibration that is slightly slower than engine speed and if the tech didn't look at the engine speed side of the data it could have easily been overlooked. General Motors has published multiple technical service bulletins pertaining to torque converter clutch shudder issues in their 8-speed Information ⇒ Follow published SI diagnostics if TCC shudder is present. If the TCC slip speed is in the range of 10 RPM or less the condition is possibly related to engine General Motors has published multiple technical service bulletins pertaining to torque converter clutch shudder issues in their 8-Speed How to convert the TCC in a GM 6l80 from a constant-slip PWM-regulated clutch to a simple old-school on/off clutch. Also includes transmission cooler thermostat delete. This problem affects over four million Issues of harsh or slipping shifts, TCC shudder, and overheating are directly related to incorrect fluid usage. 29000 miles. Many have faced common problems like shuddering and Hey, debating a project right now. If the concern is gone with the torque converter clutch disabled (Mode B, TCC Open) and is To confirm TCC shudder, the vibration concern must be created in normal operation (Mode A) of the test. This fixed some very bad torque converter The 8-Speed GM Transmission The GM 8L90 and 8L45 transmissions were developed to replace earlier 6-speed automatic The shudder incidents have supposedly been fixed with the latest TSB regarding flushing the transmission with new ATF with blue label. If the TCC slip speed is in the range of 10 RPM or less the condition is possibly related to engine The 8L90 transmission has been known to have torque converter clutch (TCC) shudder problems. • Increases TCC Holding Capacity / Corrects the ROOT CAUSE of TCC CHATTERS / The Complete Lock~Up Fix” ™ (patent pending system). Personally I’ve been going on 12k miles after my flush Got the converter shutter and fixing to rebuild it. TRNW. • Monitor engine misfires with GDS to ensure no misfires are being generated. I had the "3-flush" procedure with the Mobil According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 I just read on GM authority (posted Aug 13) that the problematic 8-speed GM trans might have a simple solution in simply flushing and using a GDS Test To confirm TCC Shudder, the vibration concern must be created in normal operation (Mode A) of the test. Customer states shudder when accelerating 8L45 8L90 Sierra Silverad Different vehicle, I was having shudder issues, no tune adjustments made any difference, reset the LTFT and it mysteriously fixed everything that was going on. The manager said that the Superior has introduced a new Shudder-Solution for GM 8L45/8L90 transmissions, the company announced. At first it was between 45-55 mph. Just developed the dreaded, well known shudder issue on light acceleration. feels like rumble strips. . I was but, this could be a fix for the 8speed trans issues No recall, but shudder or delay? For cruise-speed vibration, request TSB 18-NA-355 and confirm the shop performs a controlled exchange using 20 TCC slip speed should be 10 rpm or less also note if the shudder takes place during TCC apply. Typically, the shudder will occur during light throtle operation at 20 - 80 mph (typically 40 - 50 mph) with the I changed the fluid and filter on my 2016 Sierra to stop the shuttering and improve the shifting. With Continuously Variable Transmissions (CVTs) and Direct Malfunctioning mounts are notorious for causing a wide variety of vibration complaints including what is often thought of as a converter clutch After studying the hydraulic diagram of this units I decided to try and make this modification to engage TCC as if it would be an on/off type of engagement. If the TCC slip speed is in the range of 10 RPM or less TCC slip speed should be 10 rpm or less also note if the shudder takes place during TCC apply. Bought new, built to my order. Customer reports transmission Thread Tools Tags 8l90 tcc, tcc shudder, torque converter, transmission, transmission fluid « Previous Thread | Next Thread » Technology continues to change the nature of automatic transmissions. 50 Free shipping To ensure TCC shudder is diagnosed correctly, please drive the following schedule on a smooth road with transmission sump temperature between 50?C (122?F) - 70?C (158?F). 2 started shuddering with just over 2K miles on it. This kit contains all parts necessary to correct shudder for good, in 8L’s units AND can be installed in units that start to exhibit “SHUDDERING” of the TCC system in most cases, without removing the The STL-8L90 SHUDDER~SOLUTION™ is a game-changer for all 8L series transmissions (2007 and up). 8L45-8L90 Transmission Valve Body Repair Kit - Superior TCC Shudder FIX 2015-up $149. Anyone know if a trans flush, and filter change has been successful ! In fixing this issue ? 2021 Silverado 60,000 miles just started . It may take up to 320 km (200 mi) for the TCC shudder condition to be eliminated. If you've been experiencing issues with your 8L90 transmission, you're not alone. I've settled on an LS3/L99 engine, trying to decide on the transmission. 2 with 8 speed just started the torque converter shudder at 35,000 miles. These vehicles may have a condition in which transmission calibration allows a higher than target energy input to the torque onverter clutch My car is a 2017 ATS Premium 3.

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