If you have seen my other whining thread you know that I am trying to put 3.42s or 3.73s into a rear that I think has 2.86. I am told that not only does the carrier have to be changed, but in fact the housing so all I can jeep is the axles(big F deal!)! Someone mentioned a 4th gen car can donate a rear. Are they a bolt in swap?

 

Another answer found on 3rdgen.org. 4th gen rear is pretty much a bolt in but is wider by2" per side. Also the rear discs require some changeover parts from the drums.

 

In addition you will need E-brake cables for an 89-92 car with the PBR rear calipers. The LT1 rear is just under 4" wider, and the LS1 rear is just over 3.5" wider.

 

no need to change the housing

I went from 2.73 gears to 3.73, using the OE housing, a take-out 4th gen Zexel Torsen posi carrier and axle shafts from a 91 firebird(needed the 28 spline axles)

 

Your wheels will stick out 2in passed the fenders. To fix it you have to use 4th gen wheels, but to do that you need to get spacers for the front.

 

I live this idea best.

 

They won't stick out 2" past the quarter panels. The rear will add up to 4" extra rear track width. Each wheel will move out 1.5" to 2" depending on rear, but not past the lip. Depending on which wheel you use, they either line up with the lip or stick out just a tad - but not 2" Regardless it does look goofy