I have a set of open diff thirds for sale. Both are off my 1997 4runner. I swapped them out for a set of locked diffs. They have 4.10 gears and around 80,000 miles. Very good condition, except the external ADD mechanism on the front diff is damaged. I do not know if it works or not (it was off the 4.30 diff I got used). The ADD arm is separated from the IFS diff, but is included. The ADD shaft on the diff is easily removed, so if you are doing a front diff swap the existing ADD shaft can be used. That's what I ended up doing for my swap.
Price: $150 each (plus shipping) or $250 for the pair (plus shipping)
Make an offer. I'd prefer to sell them as a pair. Buyer pays shipping from St. Paul, MN.
PM for more information.
I can email or post pics upon request. Sorry that my first post is a classified ad, but someone at Yotatech mentioned there may be somebody who needs the 4.10 diffs on this board.