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Old 08-09-2009, 03:56 PM
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Need to ID this GM 10 bolt

I have been trying to ID a GM 10 bolt rear end I have. The numbers stamped in the axle tube are: 7FHO 236 The casting number on the center housing are b555771. I would like to use this axle in my 52 if it's a 8.5" 10 bolt but I don't think it is. Any help identifying this rear axle it greatly appreciated.
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Old 08-09-2009, 04:29 PM
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Post some pics of the housing. Here this will help. http://www.novaresource.org/axle.htm . Cole
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Old 08-09-2009, 06:43 PM
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Old 08-09-2009, 06:54 PM
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It's a 7.5" rear, as evidenced by the two fang-like cast protrusions at approximately 4:30 and 7:30 o'clock. Your picture is upside down.
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Old 08-09-2009, 07:07 PM
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Quote:
Originally Posted by ericnova72
It's a 7.5" rear, as evidenced by the two fang-like cast protrusions at approximately 4:30 and 7:30 o'clock. Your picture is upside down.
I thought so but in some way I was hoping I had a 8.5 10 bolt. It was free so no loss. I think I will find a late model Camaro for Firebird disc brake rear.
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Old 08-09-2009, 07:11 PM
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Late model (82-up) Camaro/Firebird is no better, it is the 7.5"/7.625" also, just has disc brakes.
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Old 08-09-2009, 07:34 PM
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Quote:
Originally Posted by ericnova72
Late model (82-up) Camaro/Firebird is no better, it is the 7.5"/7.625" also, just has disc brakes.
I was thinking the late model SS Camaro's and Firebirds had the larger 10 bolt. My friends SS Camaro has a stock rear and it holds up very well. It would be more than enough for my project.
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Old 08-09-2009, 07:38 PM
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Yep, they use the 28 spline axle, 7.625" ring gear version. It's better, just won't handle drag strip use for long. Would be fine in a Street Rod.
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Old 08-09-2009, 07:45 PM
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I'm building a '52 Chevy truck rat rod with a 2005 LQ4 6.0 and a T56 six speed. It will have a lot of torque but it will be a street rod. Not racing.
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Old 07-04-2012, 11:06 AM
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GM 10 Bolt

I know this is a reply to an old post, but some things are not right. I have a similar 10 bolt. The picture is not upside down, there are fangs on the top and bottom of the picture posted and on mine. Is it an 8.5 with fangs instead of blocks? My cover is about 11.5 x 10.5. I can't find any stampings on my tube though.
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Old 07-05-2012, 08:30 AM
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As far as I know all 8.5 corporate rear ends had the blocks at the bottom. If yours looks like the one in the picture then you have the 7.5 or possibly the 8.2.
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Old 07-05-2012, 03:41 PM
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Quote:
Originally Posted by jimmazak View Post
I know this is a reply to an old post, but some things are not right. I have a similar 10 bolt. The picture is not upside down, there are fangs on the top and bottom of the picture posted and on mine. Is it an 8.5 with fangs instead of blocks? My cover is about 11.5 x 10.5. I can't find any stampings on my tube though.
Judging by the size of the cover, I'd say either a 8.2 or 8.5 inch. Your best bet is to remove the cover and verify what you have by the bolt head size. I realize that involves some work, but it's the only foolproof way to know in my opinion.

If you should do this, pls. get back to the forum and let us in on what you find- this is an interesting variation that needs to be identified once and for all!

Some info that will help you in your quest (from here):

Quote:
10 bolt ID

If you don't have the codes on hand to identify if a 10 bolt rear end is an 8.5" or not, you can measure the distance between the very bottom bolt for the cover and the next adjacent bolt (either right of left), it will be 3-3/4" for a 8.5" and 3-1/4" for a 7.5".

The ring gear of the corporate 8.5" 10 bolt is secured by 7/16-20 left hand thread bolts having a 3/4" hex head on them; there will be ten bolts holding the ring gear to the differential. The ring gear is (as mentioned) 8.5" diameter and the pinion shaft diameter is the same as the 12 bolt at 1.625". The 8.5" pinion has 30 splines.

The 8.2" diff will have 10 bolts holding the ring gear on the diff, the bolts will have a 9/16" hex head and be right hand threaded. The 8.2" uses ten 3/8-24 right hand thread bolts to hold the ring gear on the diff. The pinion diameter is 1.438", having 25 splines.
Thanks.
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Old 07-05-2012, 03:46 PM
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Or you can check the pinion nut. The 8.2 uses a 1 1/8 inch socket on the nut and the 7.5 and 8.5 use a 1 1/4 inch socket. That is as long as they have a OEM type nut on them.

Some installation kits for the 8.5 and 7.5 have ring gear bolts with a 5/8 head, so if someone has rebuilt the rear end with one of these kits the bolts will have smaller heads that original.
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Old 07-05-2012, 03:51 PM
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Quote:
Originally Posted by big gear head View Post
Or you can check the pinion nut. The 8.2 uses a 1 1/8 inch socket on the nut and the 7.5 and 8.5 use a 1 1/4 inch socket. That is as long as they have a OEM type nut on them.

Some installation kits for the 8.5 and 7.5 have ring gear bolts with a 5/8 head, so if someone has rebuilt the rear end with one of these kits the bolts will have smaller heads that original.
I'll update the wiki to include this info, thanks.
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