How do I do it? I can't remember. I know you're supposed to count the number of teeth on the pinion and the ring gear but do you divide or multiply them??? I picked up a center section today from a salvage yard but the pinion section was missing and so was the tag. It came out of a 4x4 so I think (and pray) that it is a 3:50 ratio.
Thanks in advance.

1978 F-150 flareside. Primitive by todays standards but she was a jaw dropper back then. :-staun

 

Divide the number of teeth on the ring gear by the number of teeth on the pinion.

 

X-lent, A Math question !

ie: Ring gear -39 teeth
Pinion gear - 13 teeth
39 divided by 13= 3 which equals 3.00:1 ratio

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[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
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Cool...thanks guys!

1978 F-150 flareside. Primitive by todays standards but she was a jaw dropper back then. :-staun