Shift Kits and Valves

8L90 8L45 Valve Body Upgrade Kit | Shudder-Solution

STL-8L90 “SHUDDER”~SOLUTION™ for the 8L45/8L90 TRANSMISSIONS Fits ALL 2007-up 8L series units Stops the Shuddering and Chattering in all 8L series units. This kit contains all parts necessary to correct shudder for good, in 8L’s...

8L90 8L45 Oversize S4 Regulator Valve Tool Kit

Tool kit required for TransGo 8L90-S4LATE-OS

8L90 8L45 Oversized S4 Regulator Valve (2018-UP) Late 2-Land S4 Valve

New oversize S4 regulator valve for GM 8L45 and 8L90 solves significant wear issues at the S4 regulator valve position. When General Motors made a change to the S4 regulator valve in both the 8L45 and 8L90 transmissions, the updated 2-land design and...

8L90 8L45 Shift Kit Valve Body Repair Kit [Requires Tooling]

SHIFT KIT® Valve Body Repair KitFits 2015-on 8L45, 8L90Requires AFL-G2-TK toolkit TransGo 8L90 SHIFT KIT® Valve Body Repair Kit includes everything needed to address the most common complaints in the 8L45 and 8L90 transmissions from General...

8L45 8L90 S2 S3 S4 TCC Clutch Control Valve Kit | Sonnax

8L45, 8L90 S2/S3/S4/TCC Clutch Control Valve KitPart No. 154740-11K Fits any of 4 locations, S4 location fits '18-earlier only Requires:  154740-TL11 (Recommended)  154740-BST11 (Recommended) Burnt clutches, poor shift...

8L45 8L90 S1 S5 Clutch Control Valve Kit | Sonnax

8L45, 8L90 S1/S5 Clutch Control Valve KitPart No. 154740-13K Fits Either of 2 Locations! Burnt clutches and poor shifts are common issues with GM 8L45 and 8L90 transmissions. These issues can be caused by worn clutch control valves bores...

8L90 8L45 Shift Zip Kit®

8L45 8L90 Shift Zip Kit®Part No. 8L45-8L90-SHIFT-ZIP Warning: Later design valve bodies have updated the S4 valve to a single .531" diameter size. Sonnax clutch control valve included in this kit cannot be used in this location or shift...

8L90 8L45 TCC Zip Kit

8L90 8L45 TCC Zip Kit®Part No. 8L45-8L90-TCC-ZIP For converter-related complaints. Sonnax TCC Zip Kit 8L45-8L90-TCC-ZIP targets the root cause of multiple converter-related complaints by sealing the critical circuit pressure losses in the GM...

8L90 8L45 Pulse Dampeners

Even a little wear has an effect on solenoid pressure to the controlling clutch regulator valves. Flare, harsh and erratic shifts all are a result of poor clutch control. A worn dampener bore must be corrected to provide a smooth solenoid signal to the...

8L90 8L45 Pulse Dampener Tool Kit (For Use w/ 8L90-PDP-OS)

Even a little wear has an effect on solenoid pressure to the controlling clutch regulator valves. Flare, harsh and erratic shifts all are a result of poor clutch control. A worn dampener bore must be corrected to provide a smooth solenoid signal to the...

6L80 6L90 8L90 1000 Cooler Flow Bypass Delete Kit by TransGo

An easy, no-hassle cost-effective drop-in Cooler Flow Bypass Delete Kit for General Motors 6L80, 6L90, 8L90 and Allison transmissions. Corrects/Prevents/Reduces: Provides all-time cooler flow regardless of temperature Prevents overheating Reduces...

GM 6L45 6L50 6L80 8L90 SURE-COOL Cooler Flow System by Superior (2014-UP)

6L80/8L90 Sure-Cool System 2014-UP Models  TransLab Engineered by Superior Transmission Parts This Cooler System Upgrade is Recommended During Rebuild or with a Routine Transmission Service as Preventive Maintenance Overall Trans Temps Run 20%...