Originally Posted by
cobra30689
Changing the transmission from a electronic to a non-electronic (or manual) trans is quite a bit more complicated....it's not as simple as *just* changing the transmission type, and there are some who say that isn't a good idea as other problems can arise. You'll have to dig through EVERY transmission DTC and turn it off.....otherwise the PCM will be looking for a TCM and start throwing codes. IMO it's easier to just reflash the PCM with a manual OS. In my case, I went on CarGurus, searched for a 4.8 pickup with a manual trans.....grabbed the VIN, went on GM's TIS website ($40 per VIN) and reflashed the PCM with my VXDIAG pass-thru. Of course you'll have to make the rest of your changes in your list.