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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) >> Road Test Procedure >> Manual Range Selection

Manual Range Selection

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

The shift solenoids control the upshifts in the manual ranges.

Perform the following tests, using 10-15 percent throttle angle.

REVERSE

  1. With the vehicle stopped, move the shift selector to REVERSE.
  2. Slowly accelerate the vehicle.
  3. Verify that there is no noticeable slip, noise or vibration.

Manual FIRST

  1. With the vehicle stopped, move the shift selector to FIRST.
  2. Accelerate the vehicle to maximum speed.
  3. Verify the following conditions:
    • No upshifts occur.
    • The TCC does not apply.
    • There is no noticeable slip, noise, or vibration.

Manual SECOND

  1. With the vehicle stopped, move the shift selector to SECOND.
  2. Accelerate the vehicle to maximum speed.
  3. Verify the following conditions:
    • The 1-2 shift occurs.
    • The 2-3 shift does not occur.
    • There is no noticeable slip, noise, or vibration.

Manual THIRD

  1. With the vehicle stopped, move the shift selector to THIRD.
  2. Accelerate the vehicle to maximum speed.
  3. Verify the following conditions:
    • The 1-2 shift occurs.
    • The 2-3 shift occurs.
    • There is no noticeable slip, noise, or vibration.