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Transmission Whine

Discussion in 'Early CJ5 and CJ6 Tech' started by 62CheepJeep, Jun 8, 2019.

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  1. 62CheepJeep

    62CheepJeep Member

    can som help me to understand what is causing this horrible whine while in 3rd gear. As a either press the clutch or let off the accelerator it stops. Is it a bearing or gear or something else entirely.


     
    62CheepJeep, Jun 8, 2019
    #1
  2. 65seejayfive

    65seejayfive Blazin’ new trails

    I’m not sure what could be the culprit and I don’t want to ask a question that I probably already know the answer to but you are full of oil right? Both tranny and tcase?
     
    65seejayfive, Jun 8, 2019
    #2
  3. 62CheepJeep

    62CheepJeep Member

    Yep. All brand new oil.
     
    62CheepJeep, Jun 8, 2019
    #3
  4. 62CheepJeep

    62CheepJeep Member

    I will try to top it off and see if that helps.
     
    62CheepJeep, Jun 8, 2019
    #4
  5. Jeepenstein

    Jeepenstein Me like Jeep.. 2024 Sponsor

    That happened to me once right after I rebuilt the T-14, then I got home and found the 3rd gear syncro ring sitting on my bench.. Sonofa..
     
    Jeepenstein, Jun 8, 2019
    #5
  6. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sounds maybe like a bearing starting to go, complaining when under load.
     
    PeteL, Jun 8, 2019
    #6
  7. 62CheepJeep

    62CheepJeep Member

    Strange that it is only in 3rd gear. I filled the oil to halfway up the gears. No change. I really don’t want to have to learn how to rebuild a transmission. Unfortunately there is only one transmission place within 50 miles of me that works on manual transmissions. I called and it is $800 to start.
     
    62CheepJeep, Jun 8, 2019
    #7
  8. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Could it just be classic D18 gear whine?
     
    FinoCJ, Jun 8, 2019
    #8
  9. 62CheepJeep

    62CheepJeep Member

    Is there a cure? It’s very annoying and worrisome
     
    62CheepJeep, Jun 8, 2019
    #9
  10. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    have you had the clutch out lately
     
    Twin2, Jun 8, 2019
    #10
  11. 62CheepJeep

    62CheepJeep Member

    Just when I put this transmission/transfer case in why?
     
    62CheepJeep, Jun 8, 2019
    #11
  12. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    edit - I was able to listen to your video. Sounds like you have two things going on: standard D18 gear whine, and then a second noise that is more of a clatter or clacking (?) sound which would be more concerning.

    My initial comment was just to let you know that some amount of whine is pretty standard with the D18. It does get worse over time as the intermediate shaft and roller bearings wear. Knowledgeable members on here can probably walk you through a way identify where the whine is coming from, how to differentiate what I hear as two different sounds, and what to do about it (starting with checking gear oil levels). Although I don't want you to ignore a serious problem, I will also say that I was quite shocked at how loud the D18 whine really was when I first got my ecj5 (although there was no clacking sound). I was accustomed to either modern chain driven cases, or in my previous CJs, they were all later model cases that were direct drive to the rear wheels as opposed to through drive in the D18. I rebuild both my T14 and my D18 and the amount of whine decreased only slightly, but I had some other concerns that needed to be addressed as well. Get some suggestions for how to test or identify the issue from members here, and then try to be very procedural in how you can rule out different possibilities until you know what the issue is. Good luck...
     
    FinoCJ, Jun 8, 2019
    #12
    colojeepguy likes this.
  13. 62CheepJeep

    62CheepJeep Member


    Thanks. Very great advice.
     
    62CheepJeep, Jun 8, 2019
    #13
  14. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor


    just thinking out loud . clutch disc backwards
     
    Twin2, Jun 8, 2019
    #14
  15. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Try it in low range and see if there is any difference in tone. If yes, it's the t-case. (That's what it sounds like to me.)

    The transmission will most likely make more noise in first or second and be quiet in third, since third gear is just shooting the power straight-through.

    Sounds like you have an exhaust leak too.
     
    ITLKSEZ, Jun 8, 2019
    #15
  16. Glenn

    Glenn Kinda grumpy old man Staff Member

    We need a longer video with all you going through all 3 gears. That is definitely not a standard gear whine. It sounds horrible. Have you had the cover off of the transmission and inspected it with no oil in it?
     
    Glenn, Jun 8, 2019
    #16
    jpflat2a likes this.
  17. 62CheepJeep

    62CheepJeep Member

    Definitely has an exhaust leak or twelve. Lol
     
    62CheepJeep, Jun 8, 2019
    #17
    ITLKSEZ likes this.
  18. 62CheepJeep

    62CheepJeep Member


    I will try to get a longer video tomorrow. Just got home from daddy/daughter date. Pizza with my favorite girl in the world. (Crust-less for me). I have had the cover off today and noticed there was rust on the bearings where the cane shifter rides.
     
    62CheepJeep, Jun 8, 2019
    #18
    Glenn and Focker like this.
  19. 62CheepJeep

    62CheepJeep Member

    Quite possible when I swapped the motor. Original was the normal 8.5” clutch. The replacement motor had 9.25” heavy duty clutch. I did take the clutch off the flywheel during the swap because I didn’t realize they were different at first. My bad for being impatient.
     
    62CheepJeep, Jun 8, 2019
    #19
  20. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    was wondering if that was the clacking noise I was hearing - my first thought was exhaust leak as well.
     
    FinoCJ, Jun 8, 2019
    #20
    ITLKSEZ likes this.
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