I ground off the factory spring mounts, slid it(the housing)under the springs

           and placed the new spring perches on top of the housing, centered

           it, adjusted the pinion angle with an angle finder, then spot welded

           the perches and re-checked everything before the final weld.

               I was replacing the driveshaft anyway, so I had the correct yoke

           added.  I had to fab a small angle piece to hold the emergency brake

           cable and re-shape the hyd. brake line a fuzz.

               I used a wheel with 3 1/2 in backspace, although you could proabably

           use 4 1/2 B.S and a small wheel spacer 7/32 or so

               For your info, these rear ends are plentiful in u-pull's and are

             very strong. Most will have 3.73,4.10,3.08 and many have trac-lok

              from the factory. If you go looking, on the tag if there is an "L"

               after the first digit, its got a trac-lok. (ex. 3L73)  Hope this

              helps someone out there in "Y" Land...... Bill   

                   ONE small detail, the bolt pattern is 5 on 4 1/2  so you

               have to use a wheel adapter to keep the big bolt circle that

               is stock.( I was changing my front to 5 on 41/2 anyway so...)