Thread: New Updates! After swapping 98 gp gtp 3.8 s.c. into a 2002 gp se car

Originally Posted by BillBoost37

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.

Anyone know or have info on re-pinning wires on the three plugs that bolt on underneath the fuse /relay center?
I found the stumbling problem which was a loose hose between fuel pump and sending unit.
The engine runs great other than the temp gauge not moving off of 0, the low coolant light comes on as the service engine soon light, low oil level light comes on in reverse-third and first, the range selector indicator does not work at all, and fan 1 does not come at all. Any help or info or where to look would be great its been aggravating not finding any info about this.

I'm not getting any responses about my engine harness / fuse relay center questions to fix the dash cluster warning lights and gear selector lights not working right yet. To early for responses or would picks of items in question help get better responses. I really cant believe that no one hear hasn't swapped out a 2002 SE LG8 for a 98 L67 besides having both complete cars.