Cabs ??
 

Working on a 70 chevy are 67 _to 72 all the same also what about gmc trucks did they use the same cab as the chevys ?

Re: Cabs ??
 

My experience, limited, but I think not much. 67 has some small windows and small ignition. Some, but not all have the vent cut in by the striker plate. 71 and older I think have been drilled for rear view mirror, but main shape of cab I think any year would swap.. Gmc should be same.
Probly a more experienced board member could tell you more.
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Re: Cabs ??
 

With only minor differences like the smaller rear window and the headlight switch in the dash on the 67's. Some differences also in the firewall with the hand brake or foot operated emergency brake too.

Re: Cabs ??
 

71 only has a raised hump to mount the rear view mirror. 71-72 has the vent by vin plate. Some 72's have a extra round hole in firewall by main cluster of wiring harness comes out. Along with what the other guys have said