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I thought the housing or bearings are different for 8 1/4's with 2:45 rear gears???

@Evans69Notch Those pictures are inspirational for sure!

From 1974 Petty catalog:

Being that it’s an older Detroit unit and it has wire tie/lock provisions on the bolts, chances are it was an old nascar unit. Doesn’t really matter now though. I wonder if any or all the guts are shared with the common Ford Detroit lockers. Might want to take it guy that does Circle Track...

Might be an old nascar unit. I have no idea how to ID those not who made them.

Love mine. Well done, Tom !

ns1rm21 had two Comp 268XE BB mopar cams go bad immediately on run stand within 2 week period about 2 years ago. Then ran 20+ year old NOS MP cam and no issues. Many miles since. Just got a Comp multi-key BB timing chain to degree cam with about 4 months ago. Keys were way off. No more Comp.

Here's a link to the Trans Am and Corvette book I scanned in years ago: The Trans Am and Corvette Chassis design/theory/construction

From my old site, here's my old References & Literature most for Mopar handling References & Literature

Not really. They didn't really run 4 links back then in Circle Track or Road Race sedans. I'd think there are modern book on that. Especially drag race. There's one that people like. But I can't remember it.

Here's the Guldstand Article on Handling Theory I post on my site. Archived on the Wayback Machine. HANDLING THEORY Geez.. I didn't think it would copy and paste.... ---------------SOME HANDLING THEORY--------------- By now you have probably read enough "straight talk" articles about...

Yea gotta lotta old books and magazines. Here’s two other Steve Smith books. The Guldstand article that was the preface to his old catalog was great info on street to autocross/race info. I had all of that posted my site.

Oops. Sorry forgot to post pic from PE catalog

This is an NOS Petty trans cross member in blue that goes to the torsion bar support To the bottom right of the red box is a NASCAR torsion bar adjuster screw. The motor plate is for a small block obviously. It may be the same one in that Nascar Ontario Speedway 1977 poster that is of an old...

Glad those old reading list could help. I used to have that list on my old website: 68 Cuda Autocrosser. And I had a scanned in version of the "Trans Am and Corvette Chassis" book on that old aol.com site decades ago. The torsion bar cross member is in the 1974 Petty Circuit Car catalog (Cup...

do they run the Ford type ends and traditional type circle track hubs? Floater axles help with running rear disk setups. Supposed to help with rear pad knock back. Forgot the reason for this, but you can look it up. Also if you run new axle tubes you can run inner axle seal to keep diff oil in...

What do you think of the gear spread with the Passon OD gear set? Compared to a stock gear set? I know someone that had one behind a 472 Hemi and didn't like the spread. His opinion.

Yea, that makes sense in theory. But I would have had to put multiple wedges in there to get the pinon angle right. And most of all it was just too low to drive. Even without it, mine's on the brink of too low.

My car will plenty low without the dropped front hangers. With the dropped hangers, the pinion was pointed why too much upward. Even with the stock hangers I added wedge to get it set right.

In an A-body you need to notch the floor for that Gear Vendor box on the extension.

I did it every summer from 1993 to 1997 from LA to Iowa. 1200 miles. Straight through, no hotels, slept some in car. I did change the seats to cloth ones out of a Celica GTS though. Of course I was a lot younger then. And it was my only car and I had to do it. Now.... not so much.

:lol::lol: 80-85 mph at 4000 rpm. Let'er rip !

:rofl::rofl: Mike is brutal. And funny.

Rust on gear wear surface makes it a core case and sure grip unit. Potentially needs additional parts cost of gears, and labor cost of assembly. $500 minus $200= $300 ...$200 ->actual parts+labor will much be more, but you are getting new gears and fresh setup. Sure that rust MAY not cause...

go to: Mopar Axle Package 5 X 4 1/2" (5 X 4.5) Bolt Pattern 30/35 Spline It’s right there

Dr Diff sells them… IF they were in stock for $295 WITH green bearings installed the rock autos don’t have bearings

Price for each or pair?

Do you have aftermarket ring gears in the Diff ?

Stamped on the side of the gear. Need to wipe oil off. can any 1 tell me what kind of gears these are? Found 8 1/4" Rear End

Could have been someone snatching one part. They put the removed parts real nice back in the cover. Usually someone that know what they are doing. I’d assume you could buy any parts that are missing. Not a good idea to assume though. if it’s a 3.21 gear ratio stamped on it.. take it. If it’s...