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Old 01-25-2005, 09:33 AM
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10 bolt question

I need help identifying a 10 bolt that I pulled out of a 72 Buick Skylark. It has the round pumpkin with the arch's or "scallops" at 3 and 9 o' clock. It also has the ears or squared of tabs at 7 and 5 o'clock.

Because of the squared off tabs, I think it's a 8.5" 10 bolt, but I'm not sure. (I don't have the chance to open it up for a while)

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Old 01-26-2005, 10:39 AM
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Assuming the diff is the original one from GM, it probably is an 8.5" unit. If you remove the pinion yoke and count its splines you will know. 30 splines = 8.5" 10 bolt
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Old 01-28-2005, 07:21 PM
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1971 Through 1975 Skylarks were equipped with the 8.5 inch.
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Old 01-29-2005, 10:58 PM
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Thanks M&M, do you know if they were 28 or 30 spline axels?
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Old 01-30-2005, 03:40 PM
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If you get the Summit Racing catalog richmond gear has a good guide.
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Old 01-30-2005, 06:07 PM
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10 bolt identification

JamesRS ....check these links out to see if they help http://www.wallaceracing.com/carrier-id.html
http://www.novaresource.org/axle.htm
http://www.nastyz28.com/2gcog/rearaxle.html

Greywulf
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Old 01-30-2005, 10:47 PM
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Quote:
Originally posted by JamesRS
Thanks M&M, do you know if they were 28 or 30 spline axels?

28 spline. They didn't start making them with 30 spline axles until around 1988.
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Old 01-31-2005, 08:35 AM
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Thanks all
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Old 02-01-2005, 12:37 AM
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I thought the ones with the scallops at 3 & 9:00 were 8.25".
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Old 02-01-2005, 08:52 AM
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This particular unit has both the scallops that the 8.25's have and the tabs that the 8.5's have. That was what confused me. I have had two boards now tell me that this rear is 8.5".
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