TransGo Allison 1000 Shift Kit, 2001-2005 LB7/LLY



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Fits: 2001 thru 2005 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY Duramax Diesel with Allison 1000 5-Speed Transmission

This TransGo Allison Shift Kit addresses common complaints of neutral/limp-mode 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.


  • Corrects/reduces 3-4 slip & "limp mode"
  • Helps prevent burnt C2 & C3 friction plates
  • Friction torque capacity of C2 increased by approx. 111%, while the C3 & C4 brake is increased by approximately 100%
  • Combats loss of pump prime


  • (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


  • Shift "firmness/feel" will be much more noticeable
  • Recommended for performance and towing applications
  • Common trouble codes this kit can help address: P0732, P0733, P0734, P0735, P0766 & P0777