I purchased the rear end from Saleen (a 1990 Mustang 'take-out').  I had narrowed 

it about 3" on one side to match the original Ranger axle width (using the original 8" 

rear end axles) and drove it several years like that.  It had 3.00 gears and a Traction-

Lok carrier.  For this latest mod I have narrowed it quite a bit more and ordered 

custom Mosler axles to fit.  I built a jig for narrowing, it consists of a 1.5" solid steel rod

long enough to pass completely through the rear end housing and four aluminum 

bushings I turned on a lathe to fit the carrier and axle bearings and slip fit the 1.5" rod.  

I welded all the suspension brackets in place and then chopped out the desired 

amount of axle tubing and re-welded the ends on with the jig in place.  Works great!