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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!
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| | | | Joined: Dec 2020 Posts: 281 'Bolter | | 'Bolter Joined: Dec 2020 Posts: 281 | I had the tire off the back end and I thought "if I turn the brake drum one full revolution and count how many time the drive shaft turns I could verify my gear ratio". Am I thinking correct or am I mistaken?
1947 3600 Chevy
| | | | | Joined: Aug 2018 Posts: 1,004 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 1,004 | That is correct
Block the other side
Chalk mark both axle and wheel
And you will get 2x the normal turns on one wheel with the other blocked
Example
I block one wheel on my truck
Make 10 turns on the wheel and see about 25.5 turns of the input shaft
10/2 = 5 turns of both wheel if I was on the road
25.5/5 = 5.1 so that’s a 5.13 according to the books
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