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Click on image for the lowdown. 
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| | Forums66 Topics128,051 Posts1,055,735 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | The gmc should have a spicer in it. If it was a 4 speed it should have 3.90 gears. If it was a 3 speed it should have 3.08 gears.
Assuming the 270 hasn't been changed for a chevy motor, the valve cover will be held on by 2 bolts, and there will be GMC stamped on the valve cover with the "flying M" design. | | |
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