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Old May 3rd, 2016, 12:39 PM
DocB
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David
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Gearbox/t-case vibration

My gear shifter has always had a significant amount of vibration to it, but it has become concerning bad. At highway speeds it vibrates so strongly that it is almost painful to hold on to. Does anyone else have this issue? I'm thinking that it might be time to replace the bearings, but I don't really know much about transmisisons or t-cases. Also, I've never noticed it before, but the diff lock selector has started to do the same, but much slighter. Changed out the oil 2-3 weeks ago, and it helped a little. But, I checked it this weekend and the level is fine, but its JET BLACK. Like 6 month old motor oil color. Bearings going bad in there too?
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  #2  
Old May 3rd, 2016, 12:42 PM
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John B.
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I would look at driveshafts and engine/tranny mounts first. Pretty hard to get an imbalance inside one of the boxes without other major problems. Second most likely cause is the engine.

Does the vibration change with engine or vehicle speed?
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Old May 3rd, 2016, 12:57 PM
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Or on/off throttle?
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  #4  
Old May 3rd, 2016, 01:03 PM
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Quote:
Originally Posted by DocB View Post
Changed out the oil 2-3 weeks ago, and it helped a little. But, I checked it this weekend and the level is fine, but its JET BLACK. Like 6 month old motor oil color. Bearings going bad in there too?
Oil in what item? What oil did you use?
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Old May 3rd, 2016, 01:11 PM
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David
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It is definitely RPM related. It's almost nothing at idle or anything up to moderate speed, but when you get up to highway speed and RPM it vibrates pretty violently. Like holding a tattoo gun or engraver, but much more powerful.


I changed both the t-case and the gearbox. Syncromesh in the tranny and 80w90 in the t-case


Maybe I can take a video today
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Old May 3rd, 2016, 01:19 PM
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Okay.... You say rpm related and then explain it is speed related....

You are driving and it is vibrating. You shift down. Does the vibration change or stay the same? Is it only on power or at any time? You need to provide as many details as possible.
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Old May 3rd, 2016, 01:24 PM
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Hmmm, you know what, I didn't think of that. On the drive home today I'll experiment a bit.


From memory, I'd say its RPMs. If I shift into neutral at highway speed, the vibrations will go away. I will test to make sure this afternoon.
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Old May 4th, 2016, 06:45 PM
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OK, it's definitely RPM related. At highway speed it rattles like all hell, shift to neutral and adjust about goes away.
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Old May 4th, 2016, 06:53 PM
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You are saying it is only under power. You need to see if it changes when under power at the same speed but in different gears.
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Old May 4th, 2016, 07:05 PM
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Oh a video. That looks normal to me.
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Old May 4th, 2016, 07:07 PM
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Yes, RPM related under power. the higher the RPMs, the more intense the vibration.

It also does it under load with the clutch disengaged, but it is not as severe
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  #12  
Old May 4th, 2016, 07:14 PM
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Don't see a difference in frequency when shifting, so probably driveshafts if anything.

Like I said, does not look abnormal. This is not a Porsche. The gear lever is directly bolted to the gearbox, so you feel everything from the engine to the T. case. There is no isolation.
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  #13  
Old May 4th, 2016, 07:21 PM
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David
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From feeling, you can tell that the vibration increases with engine RPM. Really easy to tell when you're idling and revving it, the vibration goes up and down with the RPMs.

I'm going to see if I can link up with somebody else in my area and ride around with them, it's pretty hard to know what normal is if you've only driven one Defender lol
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  #14  
Old May 5th, 2016, 08:38 AM
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I'd recommend starting with the simple and inexpensive things. Engine mounts is one I recall discovering after countless head scratching and dicking around. Then I'd pull drive shafts one at a time and replace UJ if you don't have a good feeling about their condition and you haven't services them properly over time.
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