It is my understanding the AW4 used by Jeep was from 1987-1999 with a change in spline (21 to 23) about 1992.

That tranny is basically an A340 used by Toyota from 1990 - 2005. The Jeep version had a control module to combine 1st and 2nd gear which made it a 3speed tranny. Toyota applications were 4speed.

Novak and Advance Adapters may have additional info about adapters necessary for specific engines.

I THINK that was 2000 or 2001, but I don't remember exactly. Otherwise, correct. All the Jeep posts I've read recommend using the late '90s AW4 if you're swapping one in. Partially do to the 23 spline change, but I think I remember reading that there are some minor internal changes that improved the late AW4. Don't quote me - I ran across that information while looking for other stuff so I may be incorrect.



Hmmm. Knew about the 1-2 thing on the Jeep and Mitsu AW4. Didn't know that about the Toy version.



When swapping a non-Mitsu AW4 into a Montero or Montero Sport, you need the Mitsu bell housing. I don't know about elsewhere but that is a PITA to find in CO. Easier to find an entire Mitsu AW4.

I misread the post when I replied. If you're swapping a '97 Cherokee AW4 23-spline into a Mitsu you don't need the 23-spline Jeep output shaft or output adapter housing as you'd already have that.

Transmission and a Mitsu bell housing should be it if you're going to run it as a manual shift setup without a TCU. Otherwise, TCU, wiring, shifter and associated parts and pieces.

The dipstick is on opposite sides between the Cherokee and the Mitsu. I don't know if that would cause an issue or not. Looked to me like it'll clear the 3.0L exhaust but I haven't tried, so ....

There is a TSB referencing a deeper sump (higher volume) transmission pan for the '97-'98 Montero Sport AW4. I presume that applies to the Montero as well. Just trivia. I know some people ask about this on the Jeep boards and no one ever has an answer.

Edward

Also because the Jeep & Mitsu shared the AW4 transmission you can now also swap in a Jeep transfer caseNP231 or NP 242 & get a better low ratio of 2.72. Go one step further & you can add a crawler box like NWF or Behemoth (now out of business) like I have done and have super super low gearing. Basically you can use an 6 bolt Jeep pattern setup.

Yep, anything with the Jeep 6 bolt pattern and the 23 spline. Klune and also the Rocktrac 4:1. The Rubicon Rock-Trac won't fit in my Sport without a body lift. I think 1" would do it but 2" for sure would take care of that.

Sucks Behemoth is out of business. Looks like D&D is done, too.

Edward

Damn, I didnt know Duffy had gone too. Not many options now, seems NWF have the market cornered now. Theirs seems a quality product with good aftersales service.

Looks like it. There hasn't been any response on Pirate for 6 months and I know people have been having problems getting in touch with him for a while now.

Don't know about NWF quality yet, but I will here soon. Looks like my Eco box just showed up yesterday afternoon. I'm less than impressed with their pre-sale support. Blew me off after the first email and only answered half the 6-8 questions I had. If there were anyone else to get this from I'd go elsewhere.

Edward

I wondered what went wrong with Duffy, apparantly he has been in business since 1999 & in 2012 employed some more staff.

maybe he,s retired, maybe he,s sick?

With NWF I asked a Q (before I got the Strong Box) , never got a reply. I think they are a bit selective on their answers.

I don't know. I was planning on giving him a shout here after the holidays just to see how he's doing.

Manufacturing economy is picking up so maybe his regular business has just overrun the 4X stuff. Guess that'd be a good thing for him, but not for us.



Yea, I think I have a reasonably good idea why, but I'm not going to get into that.

BTW, how do you fill and drain the Strong Box?

Edward

I tapped a 1/2" bsp hole in the bottom & one near the top. The ones already provided didnt quite line up right with my clocked position. I ran a 3/4" hose up into the engine bay from the hole I tapped for filling, makes filling very easy since I am using atf , it flows freely. i also made up a sight tube from some poly ethylene tubing I bough off ebay.

Ok, so you DID do something about that. I thought I remembered you saying you were going to do something. I was wondering. I read the directions from NWF and basically they say pull a plug, fill the box and put the vent elbow in and run a vent line. There's no way to fill or drain the box without pulling the entire assembly.

Sight tube is easy enough. Still have plenty of the tube I used for Duffy's and the NP231 in the big Sport and a couple extra fittings. Need to get a couple more for the new t-case.

Ok, so you just used a pipe plug for the drain fitting? NWF uses a fitting that uses much smaller hose. Hmmmm. Dang! I was hoping to not have to involve a machine shop this go-around.

Did the Strong Box guys specify ATF or synthetic gear oil? I noticed that NWF says 80-90 full synthetic gear oil. Doesn't seem right to me. I remember talking to Duffy about this but I don't remember what we talked about. He specified the same full synthetic AFT that you normally put in a NP231.

Edward