8.25 8 1/4 education needed

Some info on 8.25 rears

Carriers:
73-75: uses small carrier bearings
75-up: uses larger carrier bearings
Carriers are interchangable from73-96 as long as correct bearings are used

Ring and pinion ratios: 2.21, 2.47, and 2.56 uses its own dedicated carrier which cannot be used with numerically higher ring and pinion

Axles:
73-96 uses 27 spline axles
96- up uses 29 spline axles
All A body axles are 27 spline

Ring and pinion gears:
Interchangable from 73-04 as long as correct carrier for ratio is used.