Upgrades

4T40E 4T45E Pressure Regulator Valve & Bore Repair w/ Tools

Almost everything bad that happens to this transmission is caused by excessive wear in PR Valve Bore. Fix it while you have it so you won’t get to do it again free! Includes: Pressure regulator valves and springs Pump slide springs Reamer...

4T40E 4T45E Pressure Regulator Valve and Bore Repair Kit (1995-UP) 5-Fixes

Pressure Regulator Valve and Bore RepairNo ToolsEnough parts to fix 5 valve bodiesFits all 4T40E, 4T45E 1995-on Almost everything bad that happens to this transmission is caused by excessive wear in PR Valve Bore. Fix it while you have it so you...

GM 4T40E 4T45E Solenoid SURE-COOL Upgrade Kit by Superior (STL006)

4T40E/4T45E Transmission Solenoid SURE-COOL Upgrade Kit Made in the USA by Superior Transmission Parts Stop and go driving also spends most time in 1st or 4th gear, and passes through 2nd and 3rd very quickly when accelerating from a stop.  The most...