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94 4 cylinder trans issues

Discussion in 'Wrangler YJ (1986-1995)' started by 94jeepgirl, Jan 3, 2017.

  1. Jan 3, 2017 at 9:05 PM
    #1
    94jeepgirl

    94jeepgirl [OP] New Member

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    My jeep is a 4 cylinder automatic. When I'm cruising above 45 it's slipping in and out of gear. The fluid is full and the filter is new. Any ideas? Thanks in advance for any help.
     
  2. Jan 4, 2017 at 7:31 PM
    #2
    OFFGRID

    OFFGRID Well-Known Member

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    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    Did you just replace your filter? Was it doing this before the new filter? Could be something not hooked up like speed sensor or vacuum line. Sounds like it is trying to downshift on you but when it does it realizes it doesn't need to. What year is your jeep? Is it lifted? Does it have bigger than stock tires?
     
  3. Jan 4, 2017 at 7:39 PM
    #3
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
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    Messages:
    1,815
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    In order to check your transmission fluid the jeep must be running and at operating temperature. If you checked it with the engine off and you read full then you are probably a quart low.
     
  4. Jan 5, 2017 at 7:07 AM
    #4
    94jeepgirl

    94jeepgirl [OP] New Member

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    It's a 94. We changed filter and fluid about 200 miles ago. It was fine before we did and after. I drove it the day before and it was good then. When I checked the fluid it was at running temp and running in park. No it's not lifted and the tires are one size smaller.
     
  5. Jan 5, 2017 at 9:58 AM
    #5
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
    Messages:
    1,815
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    My first thought is to check all vacuum lines and wires, and make sure everything is hooked up. Check them for any cracks or breaks.

    I found these,

    QUESTION
    "1994 jeep YJ Automatic transmission does not shift into 3rd all the time. This has happened several times now and seems to straighten itself out - not this time. It used to kick down at 40 mph. Replaced tranny and engine 12000 miles ago."

    ANSWERS
    "For your sake I hoping its a shift solenoid. Yes its in the valve body and there is some transmission surgery involved but its not that pricey. Otherwise it could be the shifter , manual shift valve, 3rd gear linkages etc. This is major tranny surgery. keep me posted."

    "sounds like it is limp mode could have a bad valve body in trans
    these earlier years jeeps had some issues with valve bodys"

    "valve body in the transmission"

    "No such thing as an easy or inexpensive fix when it comes to a transmission. Since the unit needs to come out and apart in order to do any internal repair, it's rather foolish to do anything except a complete rebuild. Don't forget...Unlike an engine that has many components on the outside, your transmission has virtually everything inside. Have a reputable trans shop do the work. They will check the transmission and the transfer case and make the necessary repair recommendations."



    I hope that some of these help. Also I believe that there is a transmission control module. It may throw some codes. If you know someone with a code reader you might check, but it sounds like the audience believes it is the valve body.
     
    Last edited: Jan 5, 2017
    Bob likes this.
  6. Jan 6, 2017 at 12:30 PM
    #6
    94jeepgirl

    94jeepgirl [OP] New Member

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    Thanks for all the help. It's the sylinoid. Waiting for part to come in to fix it
     
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