3.55 from 8.25

The newer 3.55 from the trucks and Jeeps fit in the OE 8.25 A body rear ends.
All it takes is a different carrier bearing size.

I have a 3.55 sure grip from a Dakota in my 73-74 8.25 rear end.
Keep in mind that 97 and later 8.25s went to 29 splines.. and 96.5 and earlier were 27 splines. Sure grips are plentiful in both the auburn cone type and the Trac lok 2 pinion clutch type. Yukon is making a dura grip for the 8.25 now but requires 29 spline axles.