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Question

My 2005 duramax diesel says auto range finder is inhibited and I cant get it out of first gear or to move at times. But some times it shifts. I serviced it pulled the pan off and blead the lines. Everything looked good dealer said new tranny. Dont have enough money for that. It worked for a bit after I did this what is up? can you help me. 60,000 miles bought it from a car lot. Please help war veterin from iraq used my deployment money on this truck.

Submitted: 411 days and 20 hours ago.
Category: Chevy
Value: $9
Status: CLOSED
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Optional Information

2005 Chevrolet 6.6 Duramax 6.6 Duramax

Already Tried:
Service cleaned all parts bled the lines and tried to restart system. This tranny is really killing me. Alison is suppose to be unbreakable. I dont think I need a new one. The clutches are fine it shifts in 4 lw through all the gears. But 2h seems like it doesnt have the pressure to shift and auto range finder inhibited comes on. It worked for a bit after I did the service but still not all the way. Still goes back into first and that pops up.

Accepted Answer

Hi XXXXXXXXXXXXX, The Allison transmission has an external inhibitor switch,or range select switch.These have a tendency to go haywire, and have weird symptoms. Usually when they go bad, the range selector does not show the correct gear,the trans will not shift correctly, or at all.And the trans. can shift very harsh .I have seen this many times,and think that replacing this switch may fix your problem, Rather than tearing the trans. apart.If you have any questions, please ask. Thanks,and good luck...Gary

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Expert: Gary
Pos. Feedback: 96.2 %
Accepts: 
Answered: 10/6/2008

ASE Certified Technician

ASE Master Truck Technician,20 Years GM Shop Foreman,Fully Trained GM Trucks Light and Heavy.

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