GM 12 Bolt Upgrade Q's

[Vince@Meanstreets]

Honestly if you want to do that many upgrades you might be better off selling your factor 12 and buy a built Moser 12. That way you can do 33 spline, posi, new gears, axles and special hosing ends.

If you go this route, be sure to specify the 7900FM (flush mount) so your seal sits flush. That way you can use your brake backing plate as the retainer.

[SlowProgress]

It really isn't that hard to put new ends on your axle housing. You already know the width that works so as long as the ends that Vince recommended will mount your brakes then you just need a long 1.25 inch bar and some adapters to hold everything straight. I don't know about you but narrowing the rearend was one of those bucket-list things for me. I am pretty happy I did it. I will loan you my adapters after I am done finish welding if you want to tackle it. The bar is just ground and polished shafting from the Inter-Web. The outer adapters have a 3.15" and a 2.84" shoulder. I think that covers the large Ford and the Chevy 12-bolt diameters. Here is a photo in-process.



You probably need a pinion center finding tool also. I could loan you the one I bought from Moser. I is really well made.



The pinion is 1/2 inch to the passenger side. All the axle companies are really good at answering questions if you get unsure about something.

[Sonar Chief]

Originally Posted by SlowProgress

It really isn't that hard to put new ends on your axle housing. You already know the width that works so as long as the ends that Vince recommended will mount your brakes then you just need a long 1.25 inch bar and some adapters to hold everything straight. I don't know about you but narrowing the rearend was one of those bucket-list things for me. I am pretty happy I did it. I will loan you my adapters after I am done finish welding if you want to tackle it. The bar is just ground and polished shafting from the Inter-Web. The outer adapters have a 3.15" and a 2.84" shoulder. I think that covers the large Ford and the Chevy 12-bolt diameters. Here is a photo in-process.



You probably need a pinion center finding tool also. I could loan you the one I bought from Moser. I is really well made.



The pinion is 1/2 inch to the passenger side. All the axle companies are really good at answering questions if you get unsure about something.

I will get ahold of Moser and find out what I need for the Ford ends with tapered bearings and retainer that will accept my Wilwoods. I saw your update with the rear shot .... NICE!

Thanks for the offer, I will get back to you .....

Michael