OK guys, I have a chance to buy a 12 bolt with 3.55's for 250.00. Guy says it has like 20k miles or so. I did a search and got like 16 pages of results. I just want to know if this is a good deal and how much of a PITA it is to swap it out with my BW9. I have the 2.77 in there now. How much would it affect my speedo? Thanks for the help. Thomas

 

you'd have to swap all the brackets, good chance you'd have to change the width and on 12 bolts that means new axles, have you figured out what to do with the torque arm?

 

What do you mean change the width? Is it too long for 3rd gens? I can understand the brackets, but new axles? What do you mean about the torque arm? Thomas

 

What is the 12 bolt out of ?

 

Unless it's out of a first gen f-body or a Nova, it'll be too wide for a third gen.

There's no way to attach the third gen's torque arm to a non third gen diff. The closest thing you can do is use a ford 9" housing and buy a mounting bracket that's welded to the housing from Currie. Moser won't sell one seperatly. A 12 bolt is cast iron so welding a mount on is risky and will probably break. The only other way to use the 12 bolt is to change the rear suspension to ladder bars or a 4-link to remove the torque arm system. By the time you're done, it will be cheaper to just buy an aftermarket 12 bolt that's designed to bolt into a third gen with all the proper mounts and width.