8.25 Gearing and Posi

For rear wheel passenger cars with 8 1/4 the bare carrier with no bearings or ring gear is the same from 73 thru 89 #2881423
Must use a carrier with 2.71, 3.21 or 3.55 ratio ring and pinion.
1981 was the last year for the 3.21 in passenger cars.
Also in some years the 2.94 was an option.
For carrier bearings, just buy the smaller bearing that was used in your 1974.
Some trucks with 8 1/4 were the same as passenger cars thru 1986 with the 3.21 option.
All of the above could be ordered with sure grip.
Professor Fate has covered later models.