Heavy Duty Shift Kit for Allison 1000-2000-2400; Chevy and GMC (2001 to 2003). This kit is for working trucks, street performance, as well as competition. It prevents, reduces, and corrects: going to neutral under a load, slip, burned C2 or C3 clutches, and sticking in one gear. This kit contains Smart Clutch Control Valves for increased durability, drainback and pump priming kit, improved park pawl spring set up, and all the technical information needed. Handles up to 600+ horse power.

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