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Discussion Starter #1
I have a 632 that is going to be around 1500 HP in a 2500 lb door car and was wondering what gear you guys think I need? I hope to be running 4.40's with this combo.

It is a braced ford 9" braced rear end. The car has a 4.86 in it now.

Also, it looks like you can have a large or small pinion with the 4.86 gear. How do I tell if it has the large or small pinion?

Thanks for the help!
 

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what size rear tires you gonna run?only running 1/8 mile or1/4 also? automatic? if so what(glide or 400)? the difference in large and small pinions is large has 35 splines where the rear yoke slides on and a small pinion has 28 splines.
 

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Discussion Starter #4
1/8 mile, 34.5 rear tire, would like to go through around 72-7400. I was thinking a 4.29... Is there a way to tell the pinion with out taking the rear end apart?
 

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glide, 3 speed , or 4 speed?
 
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