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

Low Stall Speeds (Stall in Ranges 1-6)

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Low Stall Speeds (Stall in Ranges 1-6)

Condition Action
Engine not performing efficiently
  • Plugged or restricted injectors
  • High altitude conditions
  • Dirty air filters
  • Incorrect fuel/valve timing
  • Throttle linkage broken or not adjusted correctly
  • Electronic engine controls condition
The following specific sections should be helpful in defining the condition:
Stall speeds of 33% of normal implies freewheeling stator Replace the converter assembly. Refer to Torque Converter Replacement .
Engine smoke controls Compare lugback vs. static stall speed.
Incorrect torque converter Install the correct torque converter. Refer to Torque Converter Replacement .