For ***s Sake. If the guy wants a ZF in his excursion its his business. IMO a 4r is one of the biggest piles of goddamnn dog sh!t to ever be behind an engine in stock form.
I WISH I had the money back I've wasted replacing the ***n things. Where I live b/c of the terrain and loads guys haul, they don't last PERIOD. I have people killing BTS here with 300hp trucks.
I've had to replace and work on 4rs 50 to 1 vs zfs. If you want to drag race it might be the best option. If you want something that IS reliable and easy to maintain, there is no reason to not like it.
OP. Easiest way to do this would be with a donor truck. For you any 99-01 manual truck would work. You need to change the engine harness and pcm. Then you would have the pedals, floor hump, slave cylinder, etc... too.