This Allison Valve Body kit is designed for 2001-2005 LB7 and LLY, 5-Speed only, Chevrolet/GMC 1000, 2000, 2400 Heavy Duty, Work, Tow, or Race diesel trucks.

Includes our exclusive Smart Trim/Clutch Control valve assemblies and items to modify the C2 clutch piston for increased capacity and more durability.
The C2 clutch is the weak link in the early 5 Speed Allison.
Addresses goes to neutral under load; 3-4 slip; burned C2 or C3 clutches; sticks in one gear; won't move after extended parking; loss of pump prime; smart clutch control valves for increased durability; SHORT-CRISP-SMOOTH-upshifts and kickdowns.
Handles 500 Street Horsepower.

Kit includes all instructions for a trouble free installation.
Installation recommendation: Experienced technician
Installation: Transmission must removed from vehicle for kit installation.


For later 6 Speed Allison use the "SK Allison JR"