what manual transmissions mate to 4.0? - JeepForum.com
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post #1 of 8 Old 03-19-2009, 01:55 AM Thread Starter
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what manual transmissions mate to 4.0?

i might be putting in a new engine, and if so it might be a good opportunity to upgrade the tranny.

i have the ax-15 right now (which i have no problem with) but i'm looking for something heavy-duty, more like the T18. i'm hard on things, so the stronger the better. and i love the dump-truck feel to it.

other than the ax-15, what transmissions will work without adapters?

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post #2 of 8 Old 03-19-2009, 02:39 AM
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Anything behind a second- or third-gen AMC V8 or "modern era" six should work - all have the same bellhousing pattern.

OEM behind the 242ci I6 would have been the Peugeot BA-10/5 (don't bother,) the AX-15 (internal and external variants, not too bad,) and the NV3550 (an improvement over the AX-15, I understand.)

If you have the "external" AX-15, you will have an easier time finding an NV3550 - since you can check Dakotas (I think it's found with the V8-318) and possibly Durango as well. The NV3550 can use the same bellhousing as the AX-15, so you just need to make sure the input shaft has the same dimensions - unless you feel like playing mix-and-match with the clutch goodies.

With adapters, natch, things open up considerably. Why for are you looking to upgrade the gearbox? Are you planning on an OEM replacement engine, a stroker, or what? The AX-15 seems to live fairly well behind even moderate strokers, so I'm just curious.

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post #3 of 8 Old 03-19-2009, 06:13 AM
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Somewhat confused on what you "currently" have. Did you already swap the 93 drive line in???? if you didn't, then you do not have the ax-15.

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post #4 of 8 Old 03-19-2009, 02:08 PM Thread Starter
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ok sorry, right now i have the 93 4.0 with the ax-15; the previous owner swapped it in. it kinda blew up on me a couple days ago and if it can't be fixed i was planning on another 4.0, probably remanufactured. so i'm gonna have everything out of there.

i'm not real concerned about the ax-15, and not at all about it handling the 4.0, i know that's not a problem. i was just wondering if there's someone that has a more "truck feel" instead of the "car feel" the ax-15 has, if that makes any sense.
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post #5 of 8 Old 03-19-2009, 02:46 PM
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NV3550 it is pretty tough and should bolt right up. I don't know about the "truck feel".

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post #6 of 8 Old 03-19-2009, 03:06 PM
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so... are you looking for a trans with a *longer* throw than the AX-15, and more play in the shifter? That and longer shift times, maybe a heavier clutch, are about all i can think of that would make it a "truckier" feel.

A longer throw would be RETARDED. The AX-15 already takes your arm all over creation going from 1st to 5th. Feels pretty "truck" to me as it is. Compared to the manual sports cars I've had or driven that is. But then I'm putting in a short throw shifter in my AX-15, so I guess we just have have different preferences.

I vote NV3550. IF you really want a new one. You could just get a new clutch that feels different and extend the shifter arm too, if you felt so inclined. Save you time and money I would think, probably achieve the same feel.

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post #7 of 8 Old 03-19-2009, 03:16 PM
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If you just want shorter ratios and some hop then try regearing your axles. Honestly my Jeep feels just like a truck. Shift clutchless on the way up and double clutch on the way down.
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post #8 of 8 Old 03-19-2009, 05:05 PM
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If money is no object and you want a beefy trans man trans has a NV4500 conversion kit that would probably keep you happy. Found it on ebay last weekend.
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