Rear differential swap

[randykrol]

Is it safe to assume that any rear differential from 88 to 98 will interchange as long as it's in the same class (1500, 2500, 3500) and 2wd or 4wd?  I have a 1990 Silverado 2wd drum brake 3.42 non locking 10 bolt under mine.  I  would like to know which rearend will bolt up to mine.   Preferably one with disc brakes and a 3.73 gear with a locker.  

[CamGTP]

As far as I know if you got yourself another 1500 rear axle of that same era, it will just bolt right in.

 

I don't recall them ever having rear disc brakes on the 1500's though. You may be looking into the NBS body style trucks from 1999-2002 for factory rear disc. I'm not sure if the shock locations and spring perches are in the same exact spot though.