its not the welding, cause that didn't happen, but I appreciate the direction you guys are taking this. I've got a few more details for you.

The fuse that blows is the signal/rear light fuse and it blows only when in reverse, and it blows immediatly. The body shop only took off the cladding to paint and so they think there might be a wire not grounded or broke somewhere since it happens so fast. Once that fuse burns out, the blinkers, windows, cruise don;t work....

I am going to take a look at the electrical wiring to see if anything jumps out at me, but I took the car to a local Isuzu dealership, and although they were all GaGa over it, they had no advice. Actually, one dude (Master Electrical Mechanic) said that the reason the tranny was shifting so hard was probably because of the fuse. I can somewhat agree that all the problems are related, but I plug in a fresh fuse (and don't use reverse) and the thing still shifts bad.... However, if I have high RPMs then it shifts like normal, so I am mannually shifting and keeping the RPMS up there for the next few days until I can come up with something.

MORE ADVISE ANYONE????

Thanks.