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Tool Hut
Tool Hut, ASE Certified Technician
Category: Chevy
Satisfied Customers: 551
Experience:  Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
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I have GM C4500 2003 LB7 D-max, problem is when vehicle run

Customer Question

I have GM C4500 2003 LB7 D-max, problem is when vehicle run
on road at 25 miles speedometer show 85MPH, trans shift good
RPM good, but no speed, I replaced Speed sensor at allison model
1000, and closter tested, ever good and no any code in engine/trans
thank you
Submitted: 1 year ago.
Category: Chevy
Expert:  Tool Hut replied 1 year ago.

Hi, My Name is ***** ***** for posting your question to just answer. I am a independent contractor for just answer, and ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.There will probably be some equipment needed for a proper diagnosis. If you are not comfortable with this or do not have any test equipment please let me know ASAP. I also try to give all of the information you may need expecting a positive rating. I am not compensated for my time until you leave a positive rating. Your rating should be based on the service you received.

It is most likely the stepper motor for your speedometer has failed pretty easy fix. or you can opt for a reman or new cluster https://www.youtube.com/watch?v=sIEkHtLAsSo

Expert:  Tool Hut replied 1 year ago.

Hello, I have not heard from you in a few days. Do you still need assistance? I also noticed you haven't left a rating. I have assisted in good faith and am only compensated when you leave a positive rating. Please let me know if there is anything else you need to leave a positive rating. Conversations can always continue after a rating is received.