Help me identify this rear end (seller says GN)

[gbodytoys]

What's up guys. A guy at my job said that he had a Grand National rear end. When he brought it in, I used a few threads from here and the turbobuick website and I'm 99% sure this is a 7.625 out of a Monte Carlo SS (what looks like a 2TH stamp on the tube followed by a C), but I don't want to miss out on an 8.5. What rear is this?

Rear Axle Identification

Here's a listing of the performance oriented rear axles as offered from the factory in various G-body vehicles. '83-'84 SS's had 7.5's with 3.42's and TH-350's. '85-'87 SS's had 7.625's with 3.73's and 200-4R's. '83 H/O's had 7.5's with 3.73's. '84 H/O's had 8.5's with 3.73's. '85-'87 442's...

gbodyforum.com

 

[69hurstolds]

NOT an 8.5. Looks like the 7.5/7.625

Top ears for the bushings apear missing/cut/broke, whatever. You don't want this one.

This may help.

Reference Manual: Chapter 3: Axles: Identification

 

[78Delta88]

Yep, triangles missing.

From Crankshaft Coalition; ...

File:GM 10bolt id.jpg

www.crankshaftcoalition.com

 

[Built6spdMCSS]

That would be a butchered 7.5.

 

[Ugly1]

Unless you’re looking for gears and the guy was willing to open it to look at the ring gear for cracks. Stay away from it. Would say it’s very thrashed on

 

[gbodytoys]

Thanks guys. I passed on it. I am bummed out to think I would have scored a GN 8.5 for $400 though.

 

[Ugly1]

Thanks guys. I passed on it. I am bummed out to think I would have scored a GN 8.5 for $400 though.

Anything that price for one of those has a whole lot of bad vibes. $800- to $1000 to start on a 8.5” is worth looking at. But still open it up and look inside.

 

[DROLDS84]

Thanks guys. I passed on it. I am bummed out to think I would have scored a GN 8.5 for $400 though.

Yeah if it sounds too good to be true it usually is...I have a. 84' H/O 8.5...3.73 open...66k miles. Lower control arm mounts are cut off but have a new adjustable kit to replace.$1000 about 5 hours from Detroit come and get it. Pics and add in the for sale section.

 

[78Delta88]

A little off topic, but does anyone know what rear end would be in the Olds diesel Regal? I know where one is and I would think it would be a heavier duty unit, possibly a 8.5??

 

[Built6spdMCSS]

Would be worth to go and look at it to see what it is in person.