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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: Mar 2001 Posts: 316 Member | | Member Joined: Mar 2001 Posts: 316 | Sounds like your trans is an SM-420. Reverse is to the left and back towards the seat, right? Rear axle sounds like 3.90 gears. You did block the wheel that wasn't being rotated while counting ? This could throw you off on your count if it's an open differential.
*** GMC ***
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