12 bolt gear set treatment options

[Ed Wright]

Originally Posted by SSDiv6

Although Strange Engineering makes a 12-Bolt Drop Out 9" Center Section, they only recommend its use on very lightweight cars like dragsters and altered cars.

Kenny Faulk told me once he had one in Amy's Firebird Stocker. Don't know if he still uses them.

[Alan Roehrich]

Outside of factory race cars, a 9" Ford housing in a GM car isn't really legal, even if the center section accepts a 12 bolt ring and pinion, and you can't run an aluminum center section in a car that didn't have it as an OE component.

[Tom Meyer]

Put a 12 bolt in my car in 87 283 220 hp glide with a brake 3200 +, 6.14 high 1.40s 60s. Raced hard for 10 years, brackets, combos, div, and natl events. All with the same set of gears, thousands of runs, lucky maybe. Made sure from the start with steel caps, rear cover girdle and made sure the set up was dead on. Put the second set in ran them till 09 when semi retired. Working on a new housing for the car, will try the 6.00 ratio with rem finished and cyro but like everything else today the stuff is just not made the same. Good luck on the build, looks great and have fun. Only rear that has less drag from gear angle is a dana 60 but they are heavy [un sprung weight]. Tom

[Dragsinger]

Tom,

Thanks for the note. As suggested by you and Myron I am sending the gear set to Evans Performance in Georgia. They will do Cyro and REM treatments.

[Ed Wright]

Originally Posted by Alan Roehrich

Outside of factory race cars, a 9" Ford housing in a GM car isn't really legal, even if the center section accepts a 12 bolt ring and pinion, and you can't run an aluminum center section in a car that didn't have it as an OE component.

So, all these SS cars with 9" rears are illegal? (He isn't building a Stocker.) Boy, I have one of the few legal SS cars around here. LOL

[Myron Piatek]

Larry,
My differential guy set the gears up before I sent them out because he said if you choose the "shiney" REM treatment, it's difficult to get a clear pattern. Unfortunately, you don't have the option of a drop-out center section.

[Dragsinger]

Myron.

good idea and sounds reasonable. I can do that because the pinion is already in the housing with an estimated setup shim pack. I was just going down to take the pinion out and box up for shipping so your note came just in time.

Thanks

[Dragsinger]

Alan,

building a super stocker, any housing is legal

[Jeff Niceswanger]

We tried everything to get a 5.86 and 6.00 gear to live in our car....350 cu in. 993/997 with 615 estimated and around 510 torque... Mark Williams Caps, LPW Cover, Shockproof Red Line Oil.. ( Still have 5 gallon never opened). Set them up Tight...Loose...Deep...Shallow...Took the housing out and had it completely updated with additional bracing @ PK Racecars....
Never made any difference..@ 25 runs it was making noise...And @ 50 they were gone.You might run them close to a hundred, but you were holding your breath.. I think the weight is very crucial. We were @ 3300. We changed classes and went to a 3000 pound and a 5.57 gear and never had any problems . Can run this set up year after year...Those little pinions don't like weight,

[Alan Roehrich]

Originally Posted by Ed Wright

So, all these SS cars with 9" rears are illegal? (He isn't building a Stocker.) Boy, I have one of the few legal SS cars around here. LOL

Ed, you didn't read all of that. YOU were talking about a stocker in the post I quoted. I was not talking about Larry's project at all. Our SS/EA 69 Camaro has a Dana 60, I know rear ends from other manufacturers are legal in Super Stock.