Upgrades

6L80 8L90 Cooler Bypass Eliminator Kit | Sonnax

Services Two Vehicles The OE thermal bypass element in GM 6L80 and 8L90 transmissions is prone to sticking open or

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...

8L90 8L45 Drop-In Replacement PR Shuttle Valve Assembly

This pressure regulator (PR)/shuttle valve assembly is an easy, drop-in solution for a common wear location on 8L45 and 8L90 automatic transmissions. Corrects/Prevents/Reduces: High line...