Quote Originally Posted by BillBoost37 View Post
Do you have the schematics on both engine wire harnesses where they connect into the relay center? That's likely most of the problem. 3.1 probably put a pin in a different place.

Also...if you put an HD diff into a non hd w body trans, the gear ratio is going to be 3.29 instead of 2.93. That might piss off the pcm and cause cruise and abs to not work.
So if i put the std diff back in the pcm will not throw the code for incorrect gear ratio, otherwise i would need to swap the gears a chain behind the valve body?
Also not having any luck finding schematics for between relay center and firewall.