Xcalliber Allison P3 Carrier Towing/Sled Pulling Kit, 2001-2005 LB7/LLY

Part# P347A-X

$1,161.05 Includes Free Shipping.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov

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

Increase pulling power by optimizing the gearing in your Allison transmission. Xcalliber's Performance P3 carrier kit is great for hauling, towing, and sled pulling applications needing that extra step in torque.


  • 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 when towing​


  • TCM Part# 29537441 required
  • TCM recalibration/tuning required