ok, just a thought, and i may be wrong, but doesnt the 96 have a 12 bolt rear axle? i know the 90 should have a 10 bolt. 
For trackers and sidekicks, "10" and "12" bolt refer to the number of bolts that hold the ring gear on the carrier (not the number of bolts holding the diff cover on....like a "chevy 10 bolt" or "chevy 12 bolt").
If you are swapping complete thirds, then it makes no difference if you are swapping a "10 bolt" for a "12 bolt" or vice-versa. Now if you are swapping gears only, then of course you would have to use a 10 bolt ring gear on a 10 bolt carrier and a 12 bolt ring gear on a 12 bolt carrier.
That's true except for one little thing, and that's the ABS ring found on the 12 bolts, you won't be able to use it on the 10 bolts. SO, the BRAKE light will be on when you use a 10 bolt 3rd on a 12 bolt kick.
Not a big deal for 90% of us, but it would be for others.
