Tim:
Yes. The main differences on the GMC vs. Chevy are:
* Hood. GMC will bolt up, but front is different.
* Rear suspension. GMC used leaf springs, Chevy used coils.
* Dash board. GMC dash uses different guage panel from Chevy.
* Engine- a lot of GMC's used V6's that Chevy didn't use.
* Wiring harness. Similar to Chevy, but not identical.
The three that you mention: interior panels, glass and front suspension should work (other than the GMC springs which may be much stiffer if the truck has a V6. The V6's were pretty heavy).
I hope this is helpful. Where are you in Alabama?
Regards,
Steve
New Orleans
