Chrome 12 bolt housing?

[Greg Reimer 7376]

Not sure if a 12 bolt is really necessary in a U car. An 8.5" ten bolt with axles, web caps and a spool would probably be 90% as strong as the 12 bolt, and probably a bit lighter besides. Ever pick up a 12 bolt posi unit? If it's a G body, some of the Monte Carlo's and Malibus had them, and the Buick Gran Nationals. They might be getting rare by now,as well. If you get the 12 bolt, assuming it's an A body unit, QA-1 has upper trailing arms made to facilitate the swap pretty easily.Good luck on your project!

[Jeff Stout]

I picked up a complete 12 bolt Mark Williams kit with spool 33 spline axles,studs all new bearings, seals, shims, ring gear new for $600 off craigslist. It was such a deal that's why I went with looking for 12 bolt housing. I felt the 8.5 would have worked but didn't have anything to use at the time. Thanks for the tip on the QA1 upper arms.

[Mark Yacavone]

Originally Posted by Greg Reimer 7376

Not sure if a 12 bolt is really necessary in a U car. An 8.5" ten bolt with axles, web caps and a spool would probably be 90% as strong as the 12 bolt, and probably a bit lighter besides. Ever pick up a 12 bolt posi unit? If it's a G body, some of the Monte Carlo's and Malibus had them, and the Buick Gran Nationals. They might be getting rare by now,as well. If you get the 12 bolt, assuming it's an A body unit, QA-1 has upper trailing arms made to facilitate the swap pretty easily.Good luck on your project!

Greg, This is a 4200 wagon with a 307 motor..It just may need more than a 5.57 gear ratio in Phoenix, Vegas, etc.

[Greg Reimer 7376]

I think you're right. The 12 bolt does have a pretty wide gear selection.