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Bought this nova. Guy said it had a 7.5 10 bolt from 75 nova with 3.42 gear. Is this a 7.5 or 8.5 from the rear cover?
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It kind of looks like an 8.5" based on this chart
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Yup 8.5. 8.2 had a ridge in the cover like the 12 bolt and a 7.5 cover is kinda square.
 

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Mike - 74 Nova Baltimore, MD
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I agree with all posts above... definitely a GM 8.5" rear.
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Its fine unless youre going to have like 1000hp(I'm not 100% the cut off). I have a used one I will be rebuilding for my car with estimated Hp/Tq of around 450/450.
 

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Mike - 74 Nova Baltimore, MD
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The 8.5" is a good rear end... and with some aftermarket items (axles, carrier), it can be built into a very strong unit.
The diameter of the pinion in a 10 bolt 8.5" rear is the same as the pinion in a 12 bolt rear.
 

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Discussion Starter #11
The 8.5" is a good rear end... and with some aftermarket items (axles, carrier), it can be built into a very strong unit.
The diameter of the pinion in a 10 bolt 8.5" rear is the same as the pinion in a 12 bolt rear.
Thanks!! I'm only going to be running about 500hp. Probably going to shorten the rear so I will need to change axles anyways at that point.
 

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Thanks!! I'm only going to be running about 500hp. Probably going to shorten the rear so I will need to change axles anyways at that point.
Up the spline count from 28 to at least 30 when you do axles and differential....I'm not sure if anything bigger like a 33 spline is available.
Rear girdle cover.
Weld tubes to centersection, using correct rod for cast iron.(Nickle....or silicon bronze if you can TIG). Prep is key on this, so do your homework on surface prep.
It'll handle pretty much anything a similarly modified 12-bolt could handle..
 
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