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  #646  
Old May 10th, 2020, 17:36
lawsoncl lawsoncl is offline
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Re: Everything you ever wanted to know about the AW4

I'd have to look at the wiring diagrams to confirm my memory, but I believe the 98 NSS added a wire to detect the (D) position. If you wanted to use the 98 NSS, you could splice the wiring from the 98 NSS and just not connect the extra wire.
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  #647  
Old May 10th, 2020, 20:23
lawsoncl lawsoncl is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by lawsoncl View Post
I'd have to look at the wiring diagrams to confirm my memory, but I believe the 98 NSS added a wire to detect the (D) position. If you wanted to use the 98 NSS, you could splice the wiring from the 98 NSS and just not connect the extra wire.

I was wrong. Looking at the FSM for 97 and 98, the pinouts and wire colors for the NSS are identical.
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  #648  
Old May 10th, 2020, 21:43
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Ecomike Ecomike is offline
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Re: Everything you ever wanted to know about the AW4

Did you check and test the three electric solenoids in the valve body of the AW4, check for continuity in the wiring harness from the TCU to the transmission and the 3 solenoids, did you change the fluid and did you use Dex III fluid, did you try some Trans-X additive to clean any varnish from the valve body, and how do you know what gear it was in with and with out the TCU connected??? Did you shirt from 1-2 to 3 and then to drive with the TCU disconnected or did you have it in Drive the whole time? TCU bypassed second gear never engages unless the engine rpm hits some crazy like 3500+ RPM in the 1-2 selection. Is the large wiring harness connection clean with no bent pins. Did you try a new valve body first?????



Quote:
Originally Posted by swedepowr1 View Post
I've got a '97 XJ, and cannot find a '97 in our area. I have shifting problem into 3rd gear, freewheels in 3rd, until shifts back to 2nd. Disconnected TCU, trans will not shift out of 1st gear. trans bad, right? got a '98 trans. swapped tail-housings between '97 and '98. ok to bypass ISS from '98 trans to run in '97? to swap harness out of '97 trans, its extremely brittle. anyone make aftermarket harness or advice please! Non-NSS connector different on '97 and '98.

tried:4882174, 83503722, 56009463, 56009385

Thx for any advice!
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  #649  
Old May 11th, 2020, 12:32
swedepowr1 swedepowr1 is offline
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Re: Everything you ever wanted to know about the AW4

Did you check and test the three electric solenoids in the valve body of the AW4, check for continuity in the wiring harness from the TCU to the transmission and the 3 solenoids(continuity yes)

did you change the fluid and did you use Dex III fluid (YES)

, did you try some Trans-X additive to clean any varnish from the valve body (NO)

and how do you know what gear it was in with and with out the TCU connected??? (with selector in D, transmission works perfect starting 1st, shifted smooth to 2nd, then freewheeling in 3rd, until 2nd reengaged. manually shifted up, starting in 1-2, then 3 freewheels)

Did you shirt from 1-2 to 3 and then to drive with the TCU disconnected(YES)

or did you have it in Drive the whole time?(NO)

TCU bypassed second gear never engages unless the engine rpm hits some crazy like 3500+ RPM in the 1-2 selection (never shifted, 4000+rpms)

. Is the large wiring harness connection clean with no bent pins.(YES)

Did you try a new valve body first????? (NO)
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  #650  
Old May 11th, 2020, 19:24
Everley Everley is offline
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Re: Everything you ever wanted to know about the AW4

Swapping a COMPLETE '98 4x4 drivetrain into a '97 2wd possible without swapping wiring harnesses or chopping them up?

Apologize if I missed the info in this 40 page thread....
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  #651  
Old May 11th, 2020, 19:39
lawsoncl lawsoncl is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by Everley View Post
Swapping a COMPLETE '98 4x4 drivetrain into a '97 2wd possible without swapping wiring harnesses or chopping them up?

Apologize if I missed the info in this 40 page thread....

Read the very first post in the thread where it discusses swapping between years. There is a difference in the transmission rear speed sensor, trans computer and it's wiring harness. The easiest approach would be transplanting the 98 computer and it's wiring harness over. Otherwise, I believe the engine and it's sensors are the same so no changes needed to the engine computer or it's wiring harness.
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  #652  
Old May 12th, 2020, 11:17
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R6TeXJ R6TeXJ is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by swedepowr1 View Post
I've got a '97 XJ, and cannot find a '97 in our area. I have shifting problem into 3rd gear, freewheels in 3rd, until shifts back to 2nd. Disconnected TCU, trans will not shift out of 1st gear. trans bad, right? got a '98 trans. swapped tail-housings between '97 and '98. ok to bypass ISS from '98 trans to run in '97? to swap harness out of '97 trans, its extremely brittle. anyone make aftermarket harness or advice please! Non-NSS connector different on '97 and '98.

tried:4882174, 83503722, 56009463, 56009385

Thx for any advice!
Should have went with like a 96-91 tranny. Much easier to swap.
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  #653  
Old May 18th, 2020, 06:33
Everley Everley is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by lawsoncl View Post
Read the very first post in the thread where it discusses swapping between years. There is a difference in the transmission rear speed sensor, trans computer and it's wiring harness. The easiest approach would be transplanting the 98 computer and it's wiring harness over. Otherwise, I believe the engine and it's sensors are the same so no changes needed to the engine computer or it's wiring harness.
Read it a few times...I have heard '97 still has some "transition" year wiring nuisances. I wonder if swapping the '98 ECU along with the drivetrain will be enough...Or if swapping the harness will be necessary as well...
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  #654  
Old January 7th, 2021, 04:45
halmca halmca is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by kastein View Post
Agreed. I still have no solid info on 97 TCU+trans in 98+, nor 98+TCU+trans in 97.
I can add my experience. Converting a '98 XJ 2wd to 4X4, I bought a 4X4 AW-4 which I believed to be a ''98. Whatever year it is/was, it lacked an input shaft speed sensor. The boss for the sensor was not even machined.

Cutting to the chase, it didn't work. I can shift the transmission manually, from first to third to fourth. P, R, and N ok, but no second, and no TC lockup. And 'check engine' light staring me in the face. (I have cobbled together an electrical work around to make the jeep drivable, including cigarette lighter power for the lock up TC)

I now have a '00 AW-4 sitting on the floor and will install it in my XJ very soon. After a great deal of research, and after reading every word of this excellent thread, I came to the conclusion -- as did the op -- that installing a '97 or earlier AW-4 in an XJ that came with a '98 AW-4 is possible, but impractical.

So far as installing a '98 into a '97, I cant' help.

I do want to add this, however: I am nearly certain that my 'no ISS AW-4' did in fact come from an XJ with a 1998 VIN. Hence I believe that Jeep's changeover to the AW-4 with the ISS did not precisely coincide with the 1998 model year. Beware.

Last edited by halmca; January 7th, 2021 at 04:52.
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  #655  
Old January 12th, 2021, 10:29
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kastein kastein is offline
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Re: Everything you ever wanted to know about the AW4

You used that allegedly 98 trans with what TCU?
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Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread.
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  #656  
Old January 14th, 2021, 05:08
halmca halmca is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by kastein View Post
You used that allegedly 98 trans with what TCU?
This one. (see the amazon URL below) It was and is in my '98 2WD XJ that featured, among other things, an input shaft speed sensor, and four armed output shaft reluctor. Just in case I screw up the image, it is the one with the French curve mounting ears.

I think if one is considering a transmission from a '97 or '98 XJ, for whatever purpose, it would be wise establish whether it has an input shaft speed sensor irrespective of what the VIN indicates. An 'early' transmission (one with an input shaft speed sensor) won't work in a 'later' jeep without l a lot of extra work. Wish I knew then what I know now. Or to put it more simply, I wish I had read, studied and digested this entire thread before reaching for my wallet.

https://www.amazon.com/photos/all/ga...RtW7dR3kZdkorg

Last edited by halmca; January 14th, 2021 at 05:41.
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  #657  
Old January 14th, 2021, 14:43
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kastein kastein is offline
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Re: Everything you ever wanted to know about the AW4

Image isn't working for some reason. That last sentence really hits home for me, by the way, because I only knew enough to write this thread because I did exactly the same thing by buying a 98 trans for my 96. Spent money first, learned later...
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My yard looks like Sanford & Sons.
Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread.
Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want.
CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable.
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  #658  
Old January 14th, 2021, 21:44
lawsoncl lawsoncl is offline
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Re: Everything you ever wanted to know about the AW4

Quote:
Originally Posted by halmca View Post
I do want to add this, however: I am nearly certain that my 'no ISS AW-4' did in fact come from an XJ with a 1998 VIN. Hence I believe that Jeep's changeover to the AW-4 with the ISS did not precisely coincide with the 1998 model year. Beware.
We've had some posters lately who bought a used Cherokee, only to discover the previous owner swapped in an incompatible year trans and it didn't shift correctly. Was the 98 that it came out of running with this trans?

In your other post, I noted that the wire colors on the harness appeared to match up with a 94 or 95 trans.
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  #659  
Old January 15th, 2021, 04:40
halmca halmca is offline
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Re: Everything you ever wanted to know about the AW4

I think I need someone standing behind me to show me how to post images!

I don't think that you can determine which transmission you have by the color of the solenoid wires. But I'm not sure. I would not rely on that indicator.

I am about 90% sure that my semi-automatic, non ISS AW4 came from a '98 XJ, but I can't be sure. I never put my eyes on the VIN: I relied on what the seller told me. Never wise, but not always stupid. I think that some '98's may have come with the old style trans. But that's also what I want to think because it makes me look less stupid than I probably am.

In any case, the principal (and in my case, fatal) difference between what I now call the 'early' and 'late' AW4 is the presence of an input shaft speed sensor on the 'late' one. The 'early' one has the boss for the ISS cast into the xmission case, but it is not machined. There are other differences too, but the easiest way to tell is the ISS. And you can tell by merely having a look w/o taking anything apart.

Bottom line: If you're farting around with a '96 - '98 XJ, make damn sure that you're aware of which transmission you have. To say that installing the early trans in a late body is NOT PLUG AND PLAY is to put it mildly.

Here's another bottom line: Had I known of, and absorbed this thread before I started, I'd have an extra two grand to pee away on cheap whiskey as well as enjoying lap dances with my Medical Doctor friends down at the truck stop.

Last edited by halmca; January 15th, 2021 at 04:44.
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  #660  
Old January 15th, 2021, 05:39
Agreen Agreen is offline
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Re: Everything you ever wanted to know about the AW4

I feel your pain. Sort of. I pulled a transmission from a 98. I verified it was a 98 too. It didn't have an ISS and the output speed sensor was the old 1 pulse per revolution reed switch style. Not a big deal for me though, as I was going to rebuild the unit anyway, and all I had to do was build my 2wd transmission with the 4WD output shaft (with my 4 pulse output speed sensor). Once that was all done I put the transfer case adapter piece on instead of the tail cone and wham-o. 4wd AW4.

BTW, do you still have the 2wd unit? If you do, I'm curious as to what the output shaft spline count is. I kind of wonder if it's as easy as cutting it down and bolting on the extension housing to make it 4wd. I never really could get a straight answer from all the internet searches as to what the spline count was. I have long since tossed the old transmission.
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