I have thought about making a track kick to Toyota case adapter. It really wouldn't be terribly hard, time is the biggest issue for me.I think the Montero or Volvo trans might be your answer.
Here is a link where someone build an adapter to put a 23spline toyota case behind the volvo trans: https://www.pirate4x4.com/forum/suzuki/716069-volvo-aw71-transmission-install-2.html#post8978532
I would think it could be adapted for the Montero trans as well, maybe easier.
I may just try the auto and 6.xx gears and see how it works. The zuk 5spd I have is blown up and finding another one is probably next to impossible. That and unsupported welded coupler just doesn't sit well with me. I'd much rather just go to a Toyota trans and tcases.You know my previous set up on my Jeep.
my opinion, put 60s w/ 40" tires under it! Try out the 6.5:1 gears and see how you like it. if you decide you don't like it, sell me the Toyota underdrive case and adapter (I'm serious, I will buy it) and put a tracker/vitara hydraulic 5 speed behind your 2.0L w/ tracker/vitara underdrive and your 4.7:1 Toyota case behind that.
I think a 5 speed trans is mandatory behind a 4 banger unless your only rock crawling, but you may like the 3 speed/6.5:1/7/17 combo :smokin:
I know you've said before you're skeptical of Keith's zuk/Toyota and zuk/D300 doublers, but I and many other guys can assure you he builds a legit product that works great. if you were on Facebook you could see for yourself lol.
Not to mention the Toyota first gear is lower (3.65 vs 3.95) and the tcase is also lower (1.8 vs 2.28) which doesn't sound like much until you multiply it out and get 221:1 vs 303:1.
I do agree that the 5spd is probably better with a 4cyl though.