The T-18 is a 4 speed trans. I think you are refering to the Dana 18 Trans-fer case.

http://www.geocities.com/austnjpr/

 

you would have to have an adapter to put one behind the t400. you would also probably have to have drive shafts lengthened and shortend. as for which d18 there was an article in petersons 4wheel&offroad a couple of months ago that went into detail on which where better than others but i cant tell you off the top of my head.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
351w/np435/d300/d44/d60/detroits/4.56/35ss/bdlocks

 

Dana 18's after 55 or 57 have the large shaft(1 1/4) on the intermediate gear. That's the one you want. Get the twin sticks also if you can.
Pigepn

 

Fratt -

Your only choice here is going to be to buy the AA kit to adapt the Dana 18 transfer case to the TH400. I've been through this and believe me, I researched every angle. Many people will led you to believe that a Dana 18 will bolt right up behind a TH400 that originally had a Dana 20 (early 70's Wagoneers), but that's not true because that setup uses a very funky output-shaft/gear combo that would HAVE to be the factory stuff and is therefore available only in 26-tooth for the Dana 20. It would be possible to build a Dana 18 with the Dana 20 2.03 gearset and use the factory stuff, but let's face it, that sucks...

Once I figured this out, I determined that rather than spend $500 on the AA unit, AND (this is big) have a professional shop install the new mainshaft in the auto trans, I'd spend the money on a T-18 4-speed and use IH Scout parts to matre the whole mess up and use the Dana 18 transfer case and keep my offset rear.

I did this 3 years ago and never looked back. The swap from auto to stick is alot of work, but it's all labor - there's no rocket science here, and the parts you need are readily available in the junkyards from stock applications.

That's what I recommend to EVERYONE with a Q-trac. This could start a war, but I love the Dana 18, think the AMC 20 can be fine with a little beefing, and think an auto can't hold a candle to a stick off-road -especially when you consider the kick-starting, no need for a trans cooler, lower gearing (even with the torque converter mulitiplication an auto isn't close), more gears (3 vs. 4) and best of all, the compression braking.

PLUS - you can sell your Q-trac low-range unit for $100 and maybe even get some money out of the trans! Good Luck!

Chuck Hadley

 

if you get an adapter get it from hicks. their add is in the back of most 4x4 mags and they had the best price on aa adapters of anywhere i could find. this was a few years ago.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
351w/np435/d300/d44/d60/detroits/4.56/35ss/bdlocks