If your truck is experiencing erroneous transmission faults and range codes, you may need to replace your internal wiring harness. Allison internal wiring harnesses are notorious for wire degradation and fluid permeation into the pass-through connector. This permeation of fluid into the connector often causes changes in resistance and even open circuit component codes. 

This replacement internal harness from DHD has the fit and function of OE with the advantages of the newest wiring and sealing materials.

For an added layer of leak protection and longevity. Add a DHD 100-255 Internal Harness Lock, which supports the connector body and prevents accidental harness push-through during service/installation: https://www.ebay.com/itm/126559701091

Features:

• Aircraft/Medical Grade Tefzel Primary Wire
• Nitrile Connector Body O-Ring
• High Temperature Heavy Duty Wire Channel

Fitment:

• 2001-2003 Allison LCT1000 5-Speed Transmissions (6 Solenoid)
• 2001-2003 LB7 Duramax 2500/3500HD Trucks
• Production Tag RPO Code on Main Case 16-1751

Replaces:

• GM 29541371
• 121446
• 3500072
• 116446A