replacement 12 bolt rear
 

Since original 12 bolt rears are getting harder to find, Is a moser replacement 12 bolt rear legal for stock class? Forgive me for asking and maybe sounding dumb, I am new to stock class racing. I need to get a new rule book, lost the one i had, but if memory serves me correctly you have to use a factory type rear. I know that there are grey areas where rules are concerned, so I was wondering if anyone is using a newer repacement 12 bolt like the Moser and passing tech. It just seems like it would be nice to use a new setup.
Any information appreciated. Thanks

Re: replacement 12 bolt rear
 

Chupiw,

Yes, you can and that's a good move..They make a very good set-up, that bolts right in to your car.............LOL................ Dave...1033/stock(350 pont)

Re: replacement 12 bolt rear
 

Thanks Dave, I figured I could go that route, I am hesitant about building up a housing that is 30 years+ old, I would rather invest the money in a complete moser setup that will bolt right in with all new parts. I am trying to build as solid and reliable setup as possible and I dont want to do things twice.

Re: replacement 12 bolt rear
 

Most all of the companies that sell rear ends use the KTRE housing for their heavy duty 12 bolt stuff. The KTRE housing is great, because it is thick, and stiff, and you can get it with a 3.250 carrier bearing bore, so you can use an aluminum spool and 35 spline axles.

Re: replacement 12 bolt rear
 

If you are going to get a Moser rear check prices then call Lynn McCarty at 317-839-8378 and he will beat any price. The rear will ship from Moser direct to you. Any other questions call me 903-277-9947.

Re: replacement 12 bolt rear
 

I think you will find that most of the replacement 12 bolts have the upper trailing arm mounts already raised up, which is another good reason to go with the new unit.

Re: replacement 12 bolt rear
 

It's interesting that you point that out. I was internet recently researching aftermarket 12-bolt options, and I wondered how many companies actually cast their own center sections.
The companies I looked at are Mark Williams, Moser, and Strange. MW says they use DTS Express/KTRE cast ductile iron center sections with cast caps, available with stock 3.062" carrier bores or larger 3.250" carrier bores for people who want to run 35 spline axles.
Strange claims they use a "Strange designed 12-bolt case with torque arm provision." It's nodular iron, and the caps are chrome-moly. They make no mention of carrier bore diameter, but they don't offer 35-spline axles in any of their crate rearend packages.
Moser uses nodular centers with high nodular content cast iron caps held in with 1/2" bolts. They don't mention carrier bores, and they don't package 35 spline axles with these rearends.
Based solely on that information, I think I would go with the MW/DTS/KTRE unit with the larger 3.250" carrier bore so I could use 35 spline axles. I also think it's cool that MW makes FED chassis kits and parts for '57-64 Olds/Pontiac rearends.

Re: replacement 12 bolt rear
 

I use the DTS 3.25 12 bolt with strange 40 spline gun drilled axles and chrome moly tubes in my firebird...luke

Re: replacement 12 bolt rear
 

Then this is the aftermarket block of rear ends? Looking at the rulebook it says "same type from the automobile manufacturer"

Re: replacement 12 bolt rear
 

Mike Pustelney from MPR set me up with the Mark Williams stuff, which the housing is made by DTS, with the 35 spline axles. Great guy to deal with and great prices. Call him at 810-798-8998.