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Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
When the speedometer is not working, are the shifts smooth/harsh early/delayed?
Any warning lights on or flashing?
Do you have a scan tool that can see PCM inputs?
Thanks, ***** ***** pretty much working backwards. Speedo working smooth shifts. Speedo not working poor shifts. Yours is opposite.
When the speedometer is not working, since you are getting smooth shifts this means the computer is getting an accurate speed signal. Your vehicle gets its speed signal from the ABS module which gets the speed signal from the rear axle speed sensor. So we need a scan tool that can access the PCM and ABS and watch there sensor inputs and signal inputs. We need to know if the rear axle speed sensor is intermittent and we need to know if the PCM VSS signal matches the ABS and falls in line with the speedometer. It is going to take an expensive tool like a shop uses to do this. For example I use a Ford IDS that is my own and it was 2800$. I use a OTC for all other makes and it was 1600$ used on ebay many years ago.
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I like to stay in contact with my customers. I assume you were not pleased with me or my answer since you did not rate it leaving me feedback. Just so you know we can still work on this issue. We can pick up where we left off or start over. I hate you paid all that money for your question deposit and have left not satisfied. Would any diagrams or repair guides or a phone call help?.
Thanks for keeping in touch Bob.