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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) >> High Stall Speeds (Stall in Ranges 1-6)

High Stall Speeds (Stall in Ranges 1-6)

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High Stall Speeds (Stall in Ranges 1-6)

Condition Action
Not in gear Select D, DRIVE.
Low fluid level, aerated fluid Add fluid to the proper level. Refer to Transmission Fluid Checking Procedure .
Faulty torque converter Replace the torque converter. Refer to Torque Converter Replacement .
Incorrect torque converter Replace the torque converter. Refer to Torque Converter Replacement .
Clutch pressure low Refer to Low Main Line Pressure in specific Ranges, Normal Pressure in Other Ranges .
1-2-3-4 clutch or Low and Reverse clutch or 2-6 clutch slipping
Use the diagnostic tool to measure turbine speed.
Rebuild the 1-2-3-4 clutch or the Low and Reverse clutch or the 2-6 clutch.
Higher power engine Confirm proper engine match.