whats the sound of intermediate bearings going bad

Discussion in 'Flat Fender Tech' started by 47v6, Apr 11, 2016.

  1. Apr 11, 2016
    47v6

    47v6 junk wrecker! Sponsor

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    I have no transmission cover as of yet so I get to hear lots of new stuff. Second test drive today, so I am hearing everything and nothing at the same time.

    I let off gas and push clutch in to shift and I hear a distinctive "ka chunk chunk". sounds deep like something with some mass.

    Sounds like its coming from passenger side more than center.

    What do you think?
     
  2. Apr 11, 2016
    ITLKSEZ

    ITLKSEZ Volvophilic

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    Mine was a BANG while going 60 down the highway when it split my transfer case in half. I can't really remember the noises it was making before that.
     
  3. Apr 11, 2016
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    In my experience bad needle bearings let you know they're not happy by incessantly whining about it, if things are loose enough in there to make a clunk then I'd think there would be some real noise happening when moving.

    H.
     
  4. Apr 11, 2016
    47v6

    47v6 junk wrecker! Sponsor

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    Well, it does make a lot of whining noise, but not significantly worse than all the others I have driven. The clunk when letting off power is deep and meaty though. Its going to need some help I think. Tomorrow I will make doubly sure my bull gear is on tight. Maybe I will drop the Xfer case pan and see how much i can pry the gears apart. I didnt do any work on the Xfer case and that could be good or bad....

    as a back up plan, how difficult is it to exchange the early double shifters with the later single on the d18? I have one but the adapter I have for the sm420 is for small hole d18... adapter for adapter?
     
  5. Apr 11, 2016
    Twin2

    Twin2 wasn't me Sponsor

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    my transfercase shifter rattled when mine needed a new intermediate shaft .
    you want to go from twin stick to single or single to twin stick . small hole large hole doesn't make a difference . the front output housing and shift rods are what you need
     
  6. Apr 11, 2016
    47v6

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    So, I could just take off the ones on my present d18 and swap em onto a big hole replacing the single lever setup. That simple?
     
  7. Apr 11, 2016
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    Yup. As Twin2 said either will fit either using the correct housing, shift rails, linkage, etc. the single stick shifter mounted to the bellhousing adapter though so if you want to use that you will need to do some fab work to mount the pivot.
     
  8. Apr 11, 2016
    47v6

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    Thanks,
    I have no intention of reusing the single over assembly, so no worries there. I am really only concerned in the event I destroy my small hole d18.

    Now about that noise when I let off the power...
     
  9. Apr 11, 2016
    Wenaha

    Wenaha Member

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    Front driveshaft U joint maybe?
     
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  10. Apr 12, 2016
    Rralphs

    Rralphs Intelligent Rectum

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    For the clunk on pull to coast I'd look and the rear pinion yoke and make sure the it isn't moving in and out.
     
  11. Apr 12, 2016
    47v6

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    I tried to isolate the noise. Made sure it was out of 4WD, hubs unlocked, got under grabbed the drive shaft, shook it. Not it. I will check rear pinion.

    Makes lots of whine in 4WD. Now it makes it in 2WD too. Yes, its full of oil.
     
  12. Apr 12, 2016
    Danefraz

    Danefraz Sponsor Sponsor

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    on moving the twin stick... I had to 'grind' some meat off the transmission side of the front housing (at the shifter-pivot pin area) to get it to fit correctly against the case (T98). Still lots of meat left, not worried.

    BFD (before disassembly) on mine, it was making clunking and warbling of sorts... found the front end was engaged. Second to that, the rear oil was like pea-soup. Replaced the oil at both ends, and added some additive to the rear for the power-lock and pulled the lever in and out a few times on the transfer to ensure it was not engaging the front... no more probs.

    Could your FF hubs on the rear be making noises? IF you turn in the front and disengage the rears (front-wheel drive) do you still hear the same noises?
     
  13. Apr 12, 2016
    47v6

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    Yeah I did all that stuff except unlock the rear hubs and drive it around. It makes a LOT of whine in 4 high. I think there is incorrect preload on output shaft and bad intermediate bearings. I am pretty sure i did the output bearings like 8 years ago, but didnt own a dial indicator at the time, so i probably didnt set the preload with shims correctly. Thats really where the noise sounds like its coming from. Its pretty clear and i think i did a bad job way back when. I got under it today before had to drive away to work and checked everything that could make noise. I cold not replicate the problem. Its not really a big deal to drop the transfer case and rebuild it. I should have done it when it was out.

    What I would like to do is rebuild the big hole D18 case and then pull my existing one and be done in 2 hours or less. I need to research if there is an adapter for the Novak adapter to use it on that big hole case. Thats the only issue.

    Thanks
     
  14. Apr 12, 2016
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    Does the adapter you have now use the T-90 bearing retainer to center the transfer case input bearing? If so then a T-86 bearing retainer and bearing can be substituted to center the large hole transfer case.
     
  15. Apr 13, 2016
    47v6

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    The adapter I have Adapting the GM Muncie SM420 to the Jeep Dana Models 18 & 20 Transfer Cases is the one for the SM420 to D18, 3 5/32 hole. It came complete with bearings.

    I have sent an email to Novak to clarify if this will work. If it will not I will just rebuild what I have before it blows up and wrecks stuff.
     
  16. Apr 13, 2016
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    Ok, looks like according to that link the adapter will accept either the T-90 or T-86 bearing retainer. If that is the case you should be fine. Will just need the right bearing and retainer. Some of the early adapters were machined to only accept large hole or small hole cases and could not easily be converted from one to the other.
     
  17. Apr 13, 2016
    Daryl

    Daryl Sponsor Sponsor

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    How is the torque mount on the passenger side of the transfer case? Or disconnect the rear driveline and see if the pinion can produce a clunk.
     
  18. Apr 13, 2016
    47v6

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    But there are 2 different part numbers, one for big hole and one for small. I haven't had a response from Novak yet.
    The torque mount is new, but It didn't really fit together right and this may have something to do with my issue as well. When i get Home I will be sure to check that. This noise did occur before I did all this work too, just not as loud.

    Thanks guys.
     
  19. Apr 27, 2016
    scott milliner

    scott milliner Master Fabricator

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    This is how it should sound when the bearings are not worn.
     
  20. Apr 27, 2016
    47v6

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    yeah mine sounds a bit like that, just everything is about 10X louder. The whine is 20X louder for sure and you have no clunk .
     

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