2006-2008 Duramax Shift Kit (1604721)

Fits

The C2 clutch is the weakest part of the early 5-speed Allison, the BD 1604721 Shift Kit addresses this problem by applying BD's exclusive Smart Trim/ Clutch Control Valve assemblies and items to modify the C2 clutch piston for increased capacity and more durability. It also addresses the problems of going to neutral under load, 3-4 slip, burned C2/C3 clutches, sticking in one gear, not being able to move after extending parking, and the loss of pump prime. This kit is capable of handling 500 Street HP.

Part Number: 1604721

• Installation recommendation: Experienced technician
• 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 going to neutral under load; 3-4 slip; burned C2/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 & kickdowns
• Handles 500 Street Horsepower

• Refer to Manufacturer's Warranty