I'm having a little trouble finding info on 4.30 IFS gear swap info?

Passenger vs. Driver drop 7.5 IFS Diff

First Question!
I assume I can swap the 4.30 gears since both diffs are 7.5?

The next questions deal with swapping the center sections from both diffs to avoid setting up the ring and pinion. (Backlash and such)

Second Question!
Can I just swap the center sections between them?

Third Question!
What year the Automatic Disconnecting Differential (ADD) first came out?

Fourth Question!
I'm also not to sure if I can pull my NON-ADD Axle tubes and put them on the ADD center diff without running into any issues?

Any help would be great!

Ryan

 

Nothing interchanges except the internal carrier.
The 86-95 7.5 is a low pinion regular rotation ring gear.
The 95.5-04 7.5 is a high pinion reverse rotation ring gear.

Read: http://home.4x4wire.com/erik/diffs/

 

They are all passenger side drop.

A.D.D came out in 89 for pickups and 90 for 4Runners.