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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Automatic Transmission - ALLISON - Service, Diagnosis & Troubleshooting) >> Fluid Leak Diagnosis >> Dye and Black Light Method

Dye and Black Light Method

WARNING: This page is about a different variant/trim than selected.

Use the J 42220  and the J 28431-6  to isolate the leak point. See Special Tools . Fluid dye and black light kits are also available from various tool manufacturers. All transmissions that are diagnosed, that require replacement due to leakage, must be diagnosed with the leak dye and black light method.

  1. Follow the manufacturer's instructions in order to determine the amount of dye to use.
  2. Detect the leak with the black light.
  3. Make the necessary repairs.