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1971 Jeep Gear problem

Discussion in 'Early CJ5 and CJ6 Tech' started by fabrication, Oct 4, 2007.

  1. Oct 4, 2007
    fabrication

    fabrication New Member

    Chandler Arizona
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    Oct 13, 2006
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    1971 Jeep 225 V-6, Spicer 18, 3 speed trans. I just started getting a sound from either the transmission or the transfer case that sounds like two gears that are not engaging all the way and meshing together like on your manual locking hubs when they are not fully engaging. It happens in all gears and stops when I put in the clutch. It did not gradually start grinding. I put a rod on where the sound was coming from and the other to my ear and I just can't isolate it. Any suggestions? Thanks
     
  2. Oct 4, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    put the transfer case in neutral
    then shift thru all the gears as if you were driving...still noisy or not ?
    if so, clutch slipping ?
     
  3. Oct 4, 2007
    fabrication

    fabrication New Member

    Chandler Arizona
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    I put the transfer case in neutral and shifted thru the gears and the noise dissapeared.
     
  4. Oct 4, 2007
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
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    Prolly not the transfer case then. Does the Jeep move? Sounds like a trans. problem....
     
  5. Oct 4, 2007
    fabrication

    fabrication New Member

    Chandler Arizona
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    The jeep drives normal but has the gear problem. Just afraid to do major damage.
     
  6. Oct 4, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    I'd say that eliminated the trans if you shifted thru all the forward gears and no noise.
    Before tearing anything apart, you need to do some visual checks first.
    Check the trans mount and the crossmember bolts; make sure they are all in place and tight. Make sure the exhaust isn't hitting some thing somewhere. Check the clutch adjustment and linkage.
    Check ujoints for signs of rust around the caps and the bolts that hold them in. Make sure the rear driveshaft isn't bent, causing vibration when moving.
    If all checks there, it might be time to drain the oil from the transfer case and/or pull the pan and inspect.
    If the clutch were oil soaked, or bad and slipping, you would feel slipping/vibration on acceleration.
     
  7. Oct 5, 2007
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Put er up on jack stands, preload output with e-brake slightly grabbing and try going thru gears.
     
  8. Oct 5, 2007
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    Sep 10, 2003
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    sounds like the tansfer case to me. the gears in it are cut straight, making a whineing sound that sounds like it's going to throw gears out the side. simple way to check if it's normal noise or not is to pull the transfer case oil pan and see if there's damaged gears (not meshing/wrong preload) or if the large center gear is loose on the shaft (easy to fix without pulling the case apart).

    I put about a pint of lucas tranny additive in mine after the rebuild and along with making it leak alot less, it quieted it down as well.
     
  9. Oct 5, 2007
    fabrication

    fabrication New Member

    Chandler Arizona
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    I put her on jack stands and put her in gear and put a load on her with the emergency brake and the noise got louder. Any suggestions Thanks Lee
     
  10. Oct 5, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Time to pull the inspection cover on the bottom and take a look. You should open it up - check for wiggle and any visual damage. Post up pics if your not sure what your looking for.
     
  11. Oct 6, 2007
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    While you have her up on stands, put t-case in neutral and then go thru tranny gears, if you don't get the noise that pretty much eliminates tranny and suspects the t-case. hope this helps.
     
  12. Oct 6, 2007
    tjg358

    tjg358 New Member

    Loveland, Colorado
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    I had similar noise few years back, mine was intermediate shaft and bearings.
     
  13. Oct 7, 2007
    fabrication

    fabrication New Member

    Chandler Arizona
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    How hard is it to change the intermediate shaft and bearings? Is it hard to get the parts? Does the transfer case need to be droped? How much am I looking at if I take it to a shop?
     
  14. Oct 7, 2007
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    I'm not convinced that's your problem...
    unless there has been catastrophic failure, the noise others describe doesn't begin until above 40 mph and in the "neutral" throttle position.
    You're describing very loud gear clash.
    At this point, maybe dropping the pan on the transfer case and taking a look would be best and or removing the trans shift tower as well.
    The int gear and shaft/bearings can be changed without removing/dropping the transfer case.
    At this point, you should refer to the Jeep service manual for the replacement procedure; if you don't yet have one, I would strongly suggest you get one.
     
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