Fits 1999-2005 5 Speed Allison 1000-2400 series. Duramax Diesel Chevrolet, GMC Diesel/Gas Trucks Heavy Duty, Street, Show & Competition.
For later 6 Speed Allison use our other kit “SHIFTKG4-X”
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 weakest part of 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.