Fits: 2001 thru 2005 Chevy Silverado/GMC Sierra 2500HD/3500HD with Allison 1000 5-Speed

Increase torque by optimizing the gearing in your Allison transmission. Xcalliber's Performance P3 carrier kit is great for racing applications needing that extra step in torque.

Features:

• Add & optimize gearing to the transmission
• Compensate for larger radius tires with less need for differential upgrades
• Greater torque with same engine power
• Reduced stress on the engine & internals
• Increased control and stability
  

Notes:

• TCM Part# 29537441 required
• TCM recalibration/tuning ratios below required
  
  • 1st 2.81​
  • 2nd 1.74
  • 3rd 1.38
  • 4th 1
  • 5th 0.69
  • ​Reverse 4.06