TransGo SK Allison 5 Shift Kit


Fits 2001-2005 5 Speed Allison 1000-2400 series.
Works well for heavy towing, off-road, competition, or upgraded street use.

Corrects/prevents/reduces 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, stops many trouble codes. Street happy to 600 horsepower.

SKU: TRG-ALLISON-SK Category: Tags: ,


This TransGo Allison SHIFT KIT® Valve Body Repair Kit fits 2001 to 2005 General Motors vehicles equipped with the Allison 1000, 2000 and 2400 five-speed automatic transmission. Common complaints on this transmission are neutralizes under high load in 4th or 5th, burnt C2 clutch plates, no move forward or reverse, stuck in one gear as well as gear ratio and solenoid performance codes. Note: The five-speeds have an external MLP switch, while the six-speeds have an internal MLP switch.

The C2 clutch is the weak link of this Allison transmission leading to 3-4 slip complaints as well as neutralizing under heavy load in 4th and 5th and burnt C2 clutch plates. Complaints of no move after the vehicle has been parked with the engine off for an extended period of time are due to excessive torque converter drain-back and loss of pump prime.

Features and benefits:
The kit’s valve body components together with the internal modifications are designed to provide substantial gains in friction plate durability. With this kit installed the friction torque capacity of the C2 is increased by approximately 111%, while the C3 and C4 brake is increased by approximately 100%. Both increases in percentage values are when the lock-up clutch is off and line pressure is at maximum. Lastly, the TCC limit and lube regulator valve springs provided combats the excessive drain-back and loss of pump prime complaints on 2001-2003 models.

Additional information

Weight 3 lbs
Dimensions 90 × 60 × 91 in


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