Hello,
Installed a 5.3 Chevy engine into my 95 GMC truck. I have 265/70/R17 tire wheel combination. My pcm was programmed but the speedometer is off. For example, when the speedometer is showing 40mph, I'm actually driving at 48mph. I believe that my rear differential is stock from the factory. I'm not the original owner, and I don't know for sure if I do have a stock factory rear diff. If its not, what rear diff might I have with my speedometer being off 8 mph?
Installed a 5.3 Chevy engine into my 95 GMC truck. I have 265/70/R17 tire wheel combination. My pcm was programmed but the speedometer is off. For example, when the speedometer is showing 40mph, I'm actually driving at 48mph. I believe that my rear differential is stock from the factory. I'm not the original owner, and I don't know for sure if I do have a stock factory rear diff. If its not, what rear diff might I have with my speedometer being off 8 mph?