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post #1 of 22 Old 02-21-2012, 08:30 PM Thread Starter
ctm9191
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Transmission

I have an 89 MJ poineer 4.0 automatic and it decided it is done shifting on its own, also seems to have lost overdrive, all parts stores i have contacted have said a rebuild kit is going to run between 4-500 so i am going to take my chances with a scrap yard tranny. Does anyone know if i can use any cherokee tranny or does it have to be from a renix cherokee/comanche. any and all help is appriciated, especially if someone might know what may actually be bad with my current pissed off transmission.


Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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post #2 of 22 Old 02-22-2012, 04:52 AM
cruiser54
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Explain "shifting on it's own". This could be as simple as a blown fuse.
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post #3 of 22 Old 02-22-2012, 07:08 AM
Garvin
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Could be a blown fuse, as cruiser54 said or could be the TCU. I don't really know too much about automatic transmissions (chose to stay away from dealing with them because they are more of a headache with all the little parts). What I can tell you is what will fit with a swap.

For a direct swap one, you will need an '87-'90 AW4. In '91, they went from a 21 spline output to a 23 spline output. The '91+ transmissions will bolt up (up to '95 will be a direct plug in) but you will need to either swap the input shaft of the transfer case to 23 spline or grab the transfer case that was attached to the transmission, which will be a 23 spline. If you decide to swap the transfer case input shaft, you will need to get one from a '91-early '94 (you'd be safer with a '91-'93 as I'm not sure on the exact cut off date). The reason for that is because they changed the planetary gears in mid '94 to a different pitch (for lack of better words) and they will not mesh with the older style.

When I did the transmission swap in my '90, I got lucky and found an early '94. I grabbed the transmission and transfer case and swapped in the input shaft into my NP231 (mine had an SYE in it already, reason I swapped the inputs over just slapping in the other transfer case).

1986 Jeep Comanche 126000+ miles
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...

1992 Jeep Comanche 174000+ miles
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.

...RIP...
1990 Jeep Cherokee XJ 207774 miles
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion
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post #4 of 22 Old 02-22-2012, 07:52 PM Thread Starter
ctm9191
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To explain shifting on its own, when i put the truck in drive, it is in third gear, if i want it to go to first, I have to put it in 1-2 position on the shifter, If i do however, it does not go into second unless i place the shifter on "3" if I want third, I have to place it in "D". I will go out tomorrow in the day light and check all the fuses. What is the TCU? I know a good bit about the motor, just absolutly nothing on the transmission. Thank you for the help.

Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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post #5 of 22 Old 02-22-2012, 07:55 PM
cruiser54
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Up under the passengeer side dash, under the glovebox is the TCU aka Transmission Control Unit. It has an inline fuse going to it wrapped in the harness with yellow tape.Good chance the fuse is bad ot the fuse holder is corroded. Let us know what you find. Don't replace your trans just yet...........
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post #6 of 22 Old 03-01-2012, 09:44 AM
XmuthJ
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Also could be as simple as a few bad solenoids if the fuse looks okay.

|___NEW JEEP___| 87 MJ Lwb | 4.0L | ba10 | D30/D35 | NP231 |______________|
^*^*^ Waiting to go in: 94 YJ AX-15, 99 XJ NP231 (23 spline) ^*^*^
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post #7 of 22 Old 03-02-2012, 07:44 AM Thread Starter
ctm9191
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Tcm fuse is good. I found a 93 Tranny for $138 with a 90 day warranty. Ill pick it up and a Tcm on Monday, rebuild mine and sell the one I buy after mine is rebuilt.

Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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post #8 of 22 Old 03-02-2012, 08:08 PM
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Quote:
Originally Posted by ctm9191 View Post
Tcm fuse is good. I found a 93 Tranny for $138 with a 90 day warranty. Ill pick it up and a Tcm on Monday, rebuild mine and sell the one I buy after mine is rebuilt.
Don't count on it fitting. The spline count between the trans and transfer case is different.
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post #9 of 22 Old 03-02-2012, 10:57 PM
chromegrille
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most likely your transmission is okay; it's shifting in manual mode like it should.
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post #10 of 22 Old 03-03-2012, 05:52 AM
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Quote:
Originally Posted by chromegrille View Post
most likely your transmission is okay; it's shifting in manual mode like it should.
I think it's a very hasty decision to replace the trans, especially with one that won't fit. Gotta be electrical.
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post #11 of 22 Old 03-04-2012, 12:27 AM Thread Starter
ctm9191
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well with the size of metal shards in the pan when i changed the filter, i was thinking i lost overdrive and it was causeing the others to go out.

Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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post #12 of 22 Old 03-04-2012, 04:38 AM
cruiser54
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Quote:
Originally Posted by ctm9191 View Post
well with the size of metal shards in the pan when i changed the filter, i was thinking i lost overdrive and it was causeing the others to go out.
Nice details to leave out of your first post.
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post #13 of 22 Old 03-04-2012, 04:31 PM Thread Starter
ctm9191
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With the first post I had not done the fluid yet

Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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post #14 of 22 Old 03-04-2012, 06:35 PM
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Quote:
Originally Posted by ctm9191 View Post
With the first post I had not done the fluid yet
Just sayin'. ...At which post had you done the fluid and not included that info?
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post #15 of 22 Old 03-04-2012, 10:24 PM Thread Starter
ctm9191
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Quote:
Originally Posted by ctm9191 View Post
Tcm fuse is good. I found a 93 Tranny for $138 with a 90 day warranty. Ill pick it up and a Tcm on Monday, rebuild mine and sell the one I buy after mine is rebuilt.
this one, i had done the fluid change that day and called around to find a transmission, my I applogize for the confusion, tomorrow I will be heading to pick up the tranny and t-case along with a few other needed parts like, a speedometer cable (been over a year since i had a proper one)

Quote:
Originally Posted by NHRubi View Post
It's a broken kanibulen pin in your flux capacitor, take your rig off the street immediately
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