ThePIGSmith
07-29-2009, 17:49
I bought my 1993 GMC 3500 series extended length van for its good running 6.2L Diesel engine.
I got it for cheap because its 4L80E was dead.
Later, I bought a used later model 4L80E that was GM Goodwrench reman unit from gasser truck.
I had a local tranny shop install a Diesel torque converter and install it.
They struggled to get this later model 4L80E to work in my early model rig.
The modified my wiring hardness to get my '93 model TCM to talk to this newer 4L80E.
I never drove my van before, but after the tranny swap, the van's speedometer was way off.
I keep wanting to get my GPS out to see how far off, but so far, I have not.
I called the tranny shop to ask if they could reset the speedo and they told me that I would need to go to a dealer.
I stopped by a GMC dealer today and they told me that they did not have a clue what was wrong and they would need it for a 1/2 day for diagnosis (at $65 per hour)
I am creating this posting to ask for help on how to correct my VVS and get my speedo to read accurately.
I got it for cheap because its 4L80E was dead.
Later, I bought a used later model 4L80E that was GM Goodwrench reman unit from gasser truck.
I had a local tranny shop install a Diesel torque converter and install it.
They struggled to get this later model 4L80E to work in my early model rig.
The modified my wiring hardness to get my '93 model TCM to talk to this newer 4L80E.
I never drove my van before, but after the tranny swap, the van's speedometer was way off.
I keep wanting to get my GPS out to see how far off, but so far, I have not.
I called the tranny shop to ask if they could reset the speedo and they told me that I would need to go to a dealer.
I stopped by a GMC dealer today and they told me that they did not have a clue what was wrong and they would need it for a 1/2 day for diagnosis (at $65 per hour)
I am creating this posting to ask for help on how to correct my VVS and get my speedo to read accurately.