I just finished installing one, very pleased with the install, although it didnt come with out bugs. I ordered it with a 3series eaton 33spline you can get 4.11 or 4.56 with the thick ring gear to fit 3 series. The axles are shipped in a box seperate from the rear, when I tried to install the axles they would'nt fit the posi, the splines were cut to a different spool, and to top it off when I finally got the Axles back, ups must have dropped the box because it punched one of the studs out of its bore. I Just had a tough time thinking they could send it out without fitting the axles, you would think that would be part of a final quality check. I also ordered it with the ford ends,the whole thing is real nice. Cost 2100.00 Good Luck!