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Extra Aw4 Shift Postions Wtf?!


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Working on my truck today I noticed there seem to be 2 extra detents in the transmission range lever, above the park position.  At first I was baffled that the cable was to long to snap onto the lever, thinking maybe I'd installed something wrong.  Pulled the lever down 2 detents allowed the cable to snap on with the shifter in park, and then I could continue shifting all the way down through R,N,D,3,L and everything works as it should.  But if I pop the cable off the transmission, there are those two extra detents above park, and I've no clue what they could be for.  I discovered the hard way yesterday that the very top position will move the truck in reverse, and pull the truck right off it's jackstands when you think it's in park.  Anyone have an explanation for this?

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There is a writeup that is on going on naxja titled "Everything you ever wanted to know about aw4" my buddy says it's mentioned somewhere in that thread but can't recall details haven't got a chance to read through its really long but I plan on reading it

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I'd expect the arm in the nss to prevent ever getting beyond park without some serious input required. Are you sure you had everything lined up properly? I had my tranny out a month ago, and experimentally shifted through all the gears because I mess around with things like that, but didn't notice any "extra" positions. But then I didn't have the tranny hooked up to anything when I did it, and I wasn't looking for extra positions either.

Needless to say, I was curious, and skimmed the thread on NAXJA which I've run across a couple other times prior, but didn't see anything. Doesn't mean I didn't miss it within the 26 pages.

 

Also, I always use four axle stands, for the exact reason you found out.

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Everything lined up just fine.  From inside the truck, everything is normal, I can shift P-R-N-D-3-L.  From underneath the truck, I pop the cable off and I can shift ?-?-P-R-N-D-3-L.  They are very definite detents with that familiar spring-loaded click into position.  I read all 26 pages of that thread and found no answer.  Surely someone around here knows?

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Well if nothing else I'll be doing an ax15 conversion as soon as possible so I can get rid of this massive tangle of french electronics and go carb.  Once the aw4 is out I'll open it up and take a peek, maybe get my transmission genius buddy to come over and have a look.  It's definitely an extra 2 detents, you can feel the ball-and-spring mechanism inside latching as you rock the lever into those top two positions.  Plus ggcnash said he experienced the same thing, so there must be some reason for it?

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I'm almost wondering if this might be a PTO option of some kind. I've seen references to XJ's having factory PTO's in other markets, but they're all couple-sentence forum posts that are backed up by "I saw a picture on the internet somewhere but can't find it now". Although I don't remember seeing anywhere in the case that a PTO might come out, unless it's a t-case thing, which would make sense for the tranny output to be turning. Possibly one position for each direction, with output regulated to a certain speed (with the right computers hooked up, which I doubt you'd have even if they exist somewhere other than in my head). But this is all me proposing ideas that are based purely on my imagination, and don't necessarily reflect reality at all.

:dunno:

 

Also, keeping the massive tangle of french electronics, or swapping the later Chrysler electronics will result in a much better engine package than swapping to a carb, but to each their own. At any rate, this isn't the place for that discussion.

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Oh trust me, I've assembled and tuned a couple megasquirt setups before, and will be doing so again in a few days when the UPS man gets here.  (I can't wait!)  Believe me when I say I'm a huge fan of fuel injection, and what I have in mind for my truck would be far easier done with efi.  But there's no way I'm having anything french on my truck, and my abhorrence for DSM and Chrysler knows no bounds haha.  I just want a carb for the simplicity, and because it makes the project more interesting. 

 

As far as the PTO, that's an interesting thought, because I do know some of the NP231's had a PTO that could be engaged which could also disengage the front and rear driveshafts.  It makes sense now that the transmission would need to be either shifted into first or reverse, and that simply giving the owner the ability to use OD instead could have potentially catastrophic results.  Having the PTO shifter built in to the t-case shifter would make it easy to design a Park interlock and then shift into the extra two tranny positions with the t-case linkage.  It all makes sense now.  Of course, as you said, this is all speculation.  But it sure makes good sense, especially given that the topmost position is reverse (without reverse lights) and between that and park moves the truck forward.

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Power Take Off.

 

It's basically a setup for running power accessories off the engine but with the strength of the drivetrain instead of a belt on the front, which means you don't need to make room under the hood for a beefy accessory. Common PTO accessories are winches, hydraulic pumps, air compressors, farming implements behind tractors, etc.

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