I am working on my project starting with a 3100 frame grafted with C4 Vette front & rear suspension.
My cab is a 6400(15,000 gvwr) with a title. The 5 window cab I bought with the project had a severe cave in on top. Found another 5 window that's the 6400. The hood and inner/outer fenders are the only difference. Doors only vary with or without wing windows, but fit in the space. Windows all around are identical.
GMC's have different grill, but most is the same is what research has told me.


Chip

'Rusto-Mod'
'51 Chevy 3600 5 window | C4 Corvette front/rear suspension & drivetrain | everything else looks old and stock
'92 GMC Sonoma GT #15 of 806
'91 GMC Sonoma GT Extended cab 1 of 1
Trucks, Trucks.....and more Trucks