Is it automatic or manual?
If you've got an automatic, just install a REALLY nice trans cooler and you are good to go. You can get very slow with an auto trans which is nice. If manual, lets hear more about it. If you've got a SM 465 4 speed or a NV4500 5 speed in it, then you are probably in good shape.
Also what engine? If its an 85, realistically it doesn't have the same huge ridiculous power that newer engines have. If so, I'd look into a NP 231 based doubler. Cheap, plentiful, and quiet. Should be strong enough as long as you don't have a torque monster of an engine. I've been hearing people talk about weird clunks coming from their 203/205 doubler packages when the front hubs are locked. Then again, depends on what annoys you.
Of course Atlas brings so much win. I'd say drop the cash and get a 4:1 2 speed and be done with it. If you need higher gears in low range, then select a higher one with the trans (if you've got an automatic, you can upgrade the transmission with a manual valve body, probably put a shift kit in it anyway just because it'll make it feel SSSOOOOOO much better). I mean, 3 or 4 speed Atlases are cool, but I never see them. Also the Atlas 4 speed is just an atlas 2 speed with a Klune-V bolted on the front of it. Also look at Klune-Vs to see if that is what you want.
I pretty much haven't heard anything good about the monster transfer cases. Which is sad because I always liked them. Oh and the 3 speed monster...yeah, its a MONSTER.
Also if it has a 205, there are kits out there that change the low range to 3:1. This would be a great compromise between "keeping things stock" and having a better low range. Also you'd have a fresh transfer case when you are done.
