I have a 3rd Member with 3.50 gears, 31 splines and an open differential for sale.
My understanding is that all 9-inch 3rd members are a direct swap, so if you currently have 3.27 gears, you can simply bolt in my 3rd member and have
3.50 gears.
I helped a Marine working on his car, and he stated that his rear end was a
9-inch, but it turns out to have been an 8.8. He had severly worn pinion bearngs, and we intended to simply swap in a new third member and be done. We went to the junk yard and pulled the third member before putting his car on the rack and finding that it did not have this kind of rear end at all.
I have no clue of the history of this unit. We pulled it out of an Econoline van, but if my understanding is correct, the third member will fit any rear end that takes a third member, and if you want it to be limited slip, then you simply install one and get on with life.
If anybody understands any differently, or has an interest in what I have, please feel free to post here.
The data tag on the unit says WEV AZ2 4D09
3 50-9 S716P
The data plate translates according to the following page,