Transgo

S1 and S5 Oversize Regulator Valve

8L45 8L90

GM Chevy

2015-On

Transmission Removal NOT Required.

Tool Required - 8L90-S1REG-TK (See Below for Link)

Depending on wear, this valve body could use up to 2 oversize S1/S5 regulator valves.  Installation requires 8L90-S1REG-TK tool kit.

Corrects/Prevents/Reduces:

Harsh delayed reverse engagement

Slipping or missing 2-3, 3-4, 6-7 shifts

Coast downshift clunks 3-2, 4-3, 7-6

Transmission control valve errors 1/5

Stuck Off (P0746, P2723)

Stuck On (P0747, P2724)