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01-05 GM HD Allison SunCoast TransGo Shift Kit

Put the TransGo Allison SK Shift Kit in your 2001-2005 GM 2500HD/3500HD and enhance the performance of your Allison 1000,2000, and 2400 five-speed automatic transmission. Many commonly complain about the following issues with their Allison transmission: neutralizing under high load in 4th or 5th, burnt C2 clutch plates, no forward or reverse, stuck in gear, and solenoid performance codes.

This Transgo Shift Kit provides you with the internal modifications to provide substantial gains in friction plate durability. Once installed, the friction torque capacity of the C2 is increased by around 111%, and the C3/C4 brake is increased by up to 100%. Both increases come when the lock-up clutch is off and line pressure is at the max. The included TCC limit and lube regulator valve springs combat the excessive drain-back and loss of pump prime.

Helps correct, prevent, or reduce:

3-4 slip, neutralizes under load in 4th or 5th, burnt C2 and C3 friction plates, no move after extended parking, loss of pump prime, stuck in gear, Codes: P0732, P0733, P0734, P0735, P0766 and P0777


  • (2) C2 piston orifice cup plugs
  • (32) C2 piston return springs
  • (2) Drill bits
  • (2) USA-made hardened steel trim valves, balls, inner and outer springs
  • TCC limit valve spring
  • Lube regulator valve spring
  • Parking pawl pin and spring
  • Extension and pump housing gaskets

Note: Fits Duramax, Diesel 2001-2004 5-speed Chevrolet, GMC 1000 Heavy Duty & Competition Diesel/Gas Trucks.

Also fits 5-SPD models when Shift Selector has no M position.

SunCoast part number: ALLISON-SK

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Tags: GM , Allison , Trans , Go , Shift , Kit ,