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Thread: Input needed on my Tranny situation... PLEASE!

  1. #1

    Default Input needed on my Tranny situation... PLEASE! (Updated 1/3)

    I am about at the point to take it to a tranny specialist but I would like some input from fellow Jeepers first. My trans has been acting quite funny for a few weeks now. It generally doesn't happen in the first couple gears, it shifts fine there. When I am cruising at highway speeds, and go to hit the gas a little harder to pass another vehicle, my truck jerks, RPMs go through the roof and it won't shift for ****. It just puts the RPMs extremely high and won't shift unless I let off the gas completely. Keep in mind, I am not putting the petal to the floor, this is just maybe 3/4 of the way after doing a steady highway speed. What would cause my trans not to shift?? It doesn't seem like it is slipping because it definitely moves when the RPMs are racing. Please any input is appreciated

    -- Andrew

  2. #2
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    Year/Model/Engine?
    Jeeps all gone

    Hemi Ram is here

  3. #3

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    2000 Jeep Grand Cherokee 4.0 I6 242

  4. #4

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    When was the last time you changed the fluid and filter and how many miles does your Jeep have on it?

  5. #5

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    Alright, I got my Jeep on August 2 of 2005. I don't know when the last time the trans fluid was changed before I did it. When I really started noticing it was acting up, which was like 2 weeks ago I changed the fluid and the filter with mopar ATF+3. When I dropped the pan, there was a load of metal shavings on the magnet, but a fellow tech from the stealership told me it was normal. My WJ has 98,500K on the clock. Everything else runs fine.

  6. #6
    wine taster kjk's Avatar
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    Quote Originally Posted by AndrewXJ
    I changed the fluid and the filter with mopar ATF+3.
    Are you sure it was +3. The WJ requires +4.
    5.9 ZJ SCT tuned PCM/ KJK CAI/ Thorley headers with 3" Magnaflow cat and muffler/ Modded kegger/ TransGo shift kit/ Vanco brake kit/ Braided steel brake lines/ Mopar cupholder insert!

  7. #7

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    I am sure it was +3 and the WJ will take either/or as far as I know.

  8. #8

    Icon313 wj tranny fluid

    :bewhew: The guy at my local dealership told me all jeep transmissions after 1991 took atf+4 just remember back before you changed the fluid did it act up before??

    if not you need to change that fluid out asap,and you will have to flush the entire system all the lines and radiator also.

    I made the same mistake a auto parts store fellow told me I could use atf+3 with a friction modifier and for a week it was ok then it started acting up and not wanting to shift out of 1st gear and turned the mil on with a dtc of po1762, I used a drill powerd pump and went down through the dipstick tub and sucked out all the fluid and refilled it with +4 and started the motor and put it in drive for 5sec to move the new fluid into the lines and then sucked out the fluid that came from the radiator dropped the pan and put in a new filter,and that worked for about a week then it acted up again ,and today it was throughing the same code as before the po1762 turns out the governor pressure sensor went out maybe or maybe not cause of the wrong fluid but it had 78k miles and never acted up before then so to make a long story short it cost me about 200.00 to fix what the wrong fluid did to my wife 2001 wj 4x4 with the I6 and 42re transmission.

    hope this helps someone else from making the same mistake I did .
    It should also say on your dipstick which fluid it takes and also when you check the fluid the motor has to be running and in neutral if you check it in park you will get a false reading of to much fluid.

  9. #9

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    I changed the fluid because of the way its been acting. I was at the dealership when the tech put ATF+3 in and he said it's fine. Besides the fact a buddy of mine [Matt aka Egon on this board] works at the dealership and got me all the fluid I needed, maybe he can input here as well.

  10. #10

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    I just don't see an 00 using +3 and there is no question that you are NOT supposed to add +2 or +3 to +4 vehicles....

    Honestly I'd get it all out and put +4 MOPAR fluid in there....

  11. #11

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    My owners manual as well as my dipstick tells me to use +3.

  12. #12

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    The TSB says that 99-02 Grand Cherokees use +4 as factory fill, and again +3 is not to be used with ATF+4

  13. #13
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    Quote Originally Posted by AndrewXJ
    My owners manual as well as my dipstick tells me to use +3.

    As Does mine, I have a 2000 GC I6 also. My tranny has had a hard time shifting from 1st gear to 2nd.
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  14. #14

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    I have a '99 and my owners manual states to use ATF+3. So apparenlty, at least for 1999 the WJ was originally equipped with ATF+3. I bought a couple of cases of +3 a few years ago and have changed the fluid a few times now with no adverse effects. However, the TSB is stating that it is now prefferable to use +4. I guess next time I change the fluid I use the +4.

    Here's the TSB:

    2100404 - AUTOMATIC TRANSMISSION FLUID USAGE ATF+4®
    Date: 03/16/04 (supersedes 2100601 dated 6/29/01)

    Model year(s): 1999-2004

    Description: Information pertaining to automatic transmission fluid usage ATF+4®.

    Details:1999-2002 Grand Cherokee. A new transmission fluid (ATF+4® Type 9602) has been developed and is being used as factory fill for all vehicles with Chrysler automatic transmissions. Until now, vehicles originally filled with ATF+2 or ATF+3 were to be serviced with ATF+3. Effective immediately, it is recommended that all vehicles with Chrysler automatic transmissions (except for 1999 and earlier minivans) be serviced with ATF+4®.

    NOTE: ATF+4® MUST always be used in vehicles that were originally filled with ATF+4®. ATF+4® is compatible with ATF+3 and can be used to top off vehicles that currently have ATF+2 or ATF+3. DO NOT use ATF+2 or ATF+3 to top off vehicles that have ATF+4® fluid.

    Benefits:
    Better anti-wear properties
    Improved rust/corrosion prevention
    Controls oxidation
    Eliminates deposits
    Controls friction
    Retains anti-foaming properties
    Superior properties for low temperature operation

    Fluid color:
    Mopar ATF+4® is a World Class Fluid having exceptional durability. However, the red dye used in ATF+4® is not permanent; as the fluid ages it may become darker or appear brown in color. ATF+4® also has a unique odor that may change with age. With ATF+4® fluid, color and odor are no longer indicators of fluid condition and do not support a fluid change.

  15. #15
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    Was it truely metal shavings or was it the fine metal dust? The dust is normal and will coat the magnet. Shavings like from a drill bit are bad.
    Typically, when the 42re fails it slips. Yours sounds more of an electrical problem. Like a Throttle position sensor, gov. pressure sensor, or a speed sensor.
    Agreed with the others on the ATF+4 in a WJ.

  16. #16

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    Yeah, I found metal dust. Not quite metal shavings. I am taking it to a tech tomorrow to see what's up. Since he used ATF+3 and it says it in the owners manual, I guess that's why it was used. I don't think it's slipping either, I know what a slipping tranny feels like.

  17. #17
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    I'm fairly certian ATF+4 is a dealer only item at this point. There are some out there that try to use ATF+3 with an additive. It doesn't work.
    If I remember right ATF+4 from the dealer is about $20 a gallon.
    I'd get the ATF+3 out of there asap.
    Dust is normal
    Doug

  18. #18

    Icon313 fluid

    I was looking in the owners manual and in the back was a yellow paper that was a addendum to the owners manual to use atf+4.
    My wifes tranny had nothing wrong with it until I put the +3 in and I did all the work but still cost me 2 filters and alot of fluid to flush it all out and then had to change the governor pressure sensor,if your having problems with shifting hard out of first gear and running the tach to 3 or 4 k then it is the governor pressure transducer it will also throw a dtc of po1762 and may even go into "limp mode" where you only get 3,4-overdrive,from what I have found out here the 42re which is the tranny the wj used with the I-6 is electronicly controlled and as long as your not getting any slippage then it 1 of the 2 sensors (governor pressure transducer dealer only item $70.38 and the vss vehicle speed sensor is about 26.99 at autozone it is on the tailshaft but if it were acting up the speedometer would be acting crazy also.

    The stall speed on the 42re is around 1900rpm and driving normal it should shift 1,2,3,4 at around 2100 rpm and driving a little agressive it should shift about 2700-2800 rpm.
    Incase you don't know how to check stall speed set the parking brake and hold your foot on the brake pedal and put the jeep in D and floor the gas until the max rpm is reached "usually about 5-10 sec" and the max rpm is the converter stall speed if yours is greater than around 2000 rpm then I would suspect a little slippage just don't hold wot for any longer than necessary or you will overheat the fluid. now these figures are for a 2001 wj I-6 with a 42re.

    But in any case get that +3 fluid out of there.

  19. #19
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    Chrysler transmissions used +3 until mid 2001, then switched to +4. If it came with +3 from the factory, keep using +3. If you switch to +4 on a trans that did not originally use it from the factory you risk causing the seals to deteriorate. There was a TSB on this exact issue and I'll post the details of it in the next day of so.

    --Matt

    p.s. Andrew, not to be a pain, but with transmission issues you must not leave out details.
    '95 XJ Country | '96 XJ Country | '98 ZJ Laredo | '64 Impala SS
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  20. #20

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    Update: Matt and the service tech suspected it maybe the overdrive unit. Turned it off, took it on the highway, and sure enough it shifted perfectly. Working on maybe getting a rebuilt O/D, but for the time being, will it damage anything to drive with it off? TIA.

    --Andrew

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