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goodwrench9124
goodwrench9124, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3432
Experience:  Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
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Why is my Allison transmission stuck in second gear

Resolved Question:

Why is my Allison transmission stuck in second gear
Submitted: 5 years ago.
Category: Chevy
Expert:  goodwrench9124 replied 5 years ago.
Hello and welcome, doe the shift indicator in the dash work correctly?
Customer: replied 5 years ago.
No
Expert:  goodwrench9124 replied 5 years ago.

Ok, then the mostly like cause is the range selector assembly. this tranny uses inputs from the selector switch to know what gear it needs to be in. in short, it is completely electronic. replacing the range switch on the side of trans should take care of both concerns. stuck in second gear and the shift indicator problem. the switch is mounted on the left side of trans. pretty simple to replace

 

 

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  • Be sure that the neutral assurance bracket (2) is in the proper position on PNP switch (1).
  • Make sure the selector shaft is in the N (Neutral) position as follows:
  • Place a wrench on the selector shaft flats and rotate the shaft to its furthest clockwise position.
    Rotate the selector shaft counter-clockwise two detents.

     

     

     

    Align the PNP switch (5) with the main housing so that the neutral assurance bracket is facing outward.

  • While maintaining the correct PNP switch-to-selector-shaft alignment, slide the new PNP switch (5) over the selector shaft (4).
  • Customer: replied 5 years ago.
    Did u read the part I just had it apart
    Expert:  goodwrench9124 replied 5 years ago.
    did you have the trans apart or the switch?
    Customer: replied 5 years ago.
    Trams I had to replace rear extension piece off and the main shaft I put it back the way it came apart
    Expert:  goodwrench9124 replied 5 years ago.
    my apology for the delay, just replacing the extension housing shouldn't cause this problem. if the shift indicator in the dash doesn't operate correctly. this has to be addressed
    goodwrench9124 and 2 other Chevy Specialists are ready to help you