Which company for narrowing a 29 spline 8 1/4 rear end

1ToughDuster said

I pulled a 8.25 sure grip 3.92 geared 29 spline rear end from a 2001 Durango R/T 4x4.

It'll be going under my 400hp 74 Duster. Has anyone done this type of conversion before and what shops East of the Mississippi are best for narrowing the rear end and axles?

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Lots of guys on here are getting good at shortening differentials, LOL.
I for one after shortening two Ford 8.8''s would do it myself. Buy your axles the length you want, cut it and re-weld it. Or for that matter use a Ford 8.8 out of an Explorer. Good gear ratios, trac-loc and disc brakes. Couple really good threads on here about it, unless you're not able to DIY or have to keep it all Mopar.