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Originally Posted by JREs69er
Rod,
I have a 69 K20, V8 350 with 4-speed (granny gear). So does that mean I have 4.57 ratio? If I were to take the cover off to verify, what am I looking for? I remember reading something about marking the drive shaft and counting teeth on gears but don't recall exactly what needs to be done. Thanks for the response.
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I would guess 4.10s on that one. You can also tell by the BOM number that is stamped on the axle tube to the right of the pumpkin when looking under the front of the truck.