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  #1 (permalink)  
Old 12-31-2006, 03:18 PM
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Help needed for ID'ing rearend

HI folks,
I have done a lot of reading on this site to ID a 10 bolt under the 72 sbc Vega my son and I tinker with. This is a new area to us and we are learning so I ask for ya'lls patience here. When I bought the car all the guy could tell me was that he knew the rearend was not stock, and thought it came from a 79 Monza. I can see where somebody cut off old brackets, leaving metal on the passenger side axle tube. Anyway, the stampings on the front of the axles are basically unreadable. The casting #'s on the bottom of the casing is as follows:
GM N
559957
J029

Some other facts:
-The measurement of the cover is 10.8 wide and (approx) 9 5/16" tall.
-There are pronounced pairs of ears on each side, half-moon shaped, both at top and bottom of the casing, they are difficult to see in the pictures.
-The car hooks both tires on accelleration, and the rearend tends to pop on slower, tighter turns.
-The guy told me the gearing is 4:56, I tend to go with that because it runs about 2400 rpm at around 40 with a 25" tire.

I will include photos...

Is this a 7.5/7.625 or a 8.5?

Do the 7.5" have "ears on both top and bottom? It appears in ID photos that the 8.5 does...

We are hoping this turns out to be the 8.5!!!

Any information ya'll could glean from the photos and descriptions will be most appreciated!

jmbjs
Happy New Year!
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Old 12-31-2006, 05:24 PM
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Looking at the photo showing the front view, the casting appears to have a pad where a torque arm may have bolted? Is that correct? If so, that would lend credibility to the assertion that it's of Monza origin. They were, I think, 7.5" units.

Bob
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Old 12-31-2006, 05:58 PM
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This link talks about how to differentiate between 7.5, 7.625, and 8.5 models.

HTH,
Don
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Old 01-01-2007, 06:22 AM
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Well.....

It's obviously a 10 bolt rear. The most reliable way to determine the ratio and size is to pop the cover off, read the stampings on the edge of the ring gear, and count the teeth. You could also go a step further and pull an axle to check the spline count and length, just so you have better info to go on for a comparison. The pictures show the car on stands... this is the best time to perform this (where you can get at it).
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