high pitch whining in my drivetrain

Discussion in '40- & 55-Series Tech' started by missipboy, Nov 19, 2005.

  1. missipboy

    missipboy

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    it's been down so long i don't remember if it was there before. i just installed my orion and hardtop(hardtop may be the reason i can hear the whining now) and there is a high pitch whining at high speeds. i can hear it in fourth and fifth gears and the pitch changes with speed, not with the shifting of gears. it sounds like it could be a bearing, but my trans was just rebuilt and the orion came with all new bearings. could this be breakin noise? also, i don't have a shifter boot, so it would not be as strong if i had one.

    any ideas?????
     
  2. jjhancock

    jjhancock

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    what tranny are you running?
     
  3. missipboy

    missipboy

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  4. mr_manny

    mr_manny

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    mine is also making a little noise.

    A buddy said to drain the fluid from both your tranny and xfer case.
    Examine the fluid from each separately...the one w/metal deposits is likely the noise maker.

    hope this helps.
     
  5. Josie'sLandCruiser

    Josie'sLandCruiser Stop calling it a "FJ."

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    Hi All:

    Are you using the correct gear oil in each gearbox? The NV4500 requires some special GM lube oil, while AA supplies a specific type of synthetic oil for the Orion t-case.

    What shape are the u-joints on the rear drive shaft in? Are they "newer" or original pieces?

    Regards,

    Alan
    Seattle
     
  6. missipboy

    missipboy

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    brand new rear driveshaft and the tranny shop put the oil in the trans. i put 90 weight in my orion b/c that's what they told me on the phone-even though the instructions say something else.

    by the way-the orion is brand new this is the first i have run it-about 100 miles on it so far.
     
  7. cruiserjunktion

    cruiserjunktion Cruiserjunktion@gmail.com Supporting Vendor GOLD Star

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    is my girlfriend in there?
     
  8. missipboy

    missipboy

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    amen, brother.

    i told my wife to get out, but it was still making the noise.
     
  9. fng55

    fng55

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    if your noise is speed-related, than it is more likely the front /rear diff or t-case. is the noise load sensitive?
    my guess would be rear pinion bearing.
    i have also heard that the orions tend to be louder than the stock t-case?
    try changeing the oil in the t-case for synthetic?
    drive with ear plugs? (my PO's solution, 8 months w/out oil in th t-case.
    good luck, carl
     
  10. missipboy

    missipboy

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    the noise is load sensitive. what does that tell me? the rearend has all new bearings and it sure sounds like it's coming from either the tranny or tcase. i also heard that orions were supposed to be more quiet. go figure. anyway, i refuse to wear earplugs, cuz i got almost all my road noise knocked out except for this. :beer:
     
  11. VTFJ40

    VTFJ40

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    Which adapter/shaft are you using to mate the nv to the orion?
     
  12. missipboy

    missipboy

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    using AA adapter and AA 16 spline spud shaft.

    not sure of the part number
     
  13. VTFJ40

    VTFJ40

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    I would think it's the tcase. If the whine climbs with speed it has to be from that shaft back, right?

    Have you read Treeroots thread-

    https://forum.ih8mud.com/showthread.php?t=25753&highlight=orion

    I'm about to put the nv/orion combo together (don't have the orion yet), which is why I'm so interested in this.

    Good luck, and keep us posted.
     
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