Mine was nearly impossible to use when i first bought the truck. I sprayed the linkage with some PB blaster, which only helped a little. But i have found using low range every month has help it loosen back up(which i recommend).
https://forum.ih8mud.com/threads/towing-capacity-of-fj80.285116/#post-4447938
"FJ80s are 3500. FZJ80s are 5000."
Given the difference in engine output and braking capacity, it would make snese.
Also OP remember if you have a machine shop grind the seats to have them check the spring seat pressure. Some of the more lazy shops will just take care of the seats and not check pressure and shim as needed to bring it up to stock(which could also be down from heat/age).
I got mine off rock auto, it was like $75 a piece, unfortunately it looks like theyre out of stock now. They are not paint matched, just black but works well enough for me.
Interesting, wish i had known that at the time. I may have to send my old bad one in to get worked as a backup for longer wheeling trip as I could never be able to find one if the used one i tossed in were to fail.
when i needed one for my cruiser it took like 2 months to find one on ebay, and it wasnt that much cheaper than what they are talking. Those AFMs are only used for 93-94 1FZ cruisers and do no interchange with anything else, so there is little in the way of options sadly.