If you find the elusive 4.10 rear, you change the whole center section. Unbolt the drive shaft, unbolt and pull the axle shafts, then unbolt the front of the differential housing. Don't drop it, it's heavy!
Reverse the procedure to install.
This keeps your original axle housing (and width) while upgrading your gears
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
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