Driveline Vibration - Defender Source
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  #1  
Old March 20th, 2006, 11:06 PM
johare
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Driveline Vibration

Hi, I've had my 95 ST D90 a little over a week now and I have a vibration that I can't seem to figure out. The vibration occurs when the vehicle is torqued i.e. accelerating, going up a hill, etc. I have replaces all 4 u-joints with only very slight improvement. I drove it with the diff lock engaged to eliminate the TCase and it did vibrate with the diff lock engaged. I'll be dropping each shaft next but in the mean time, is there anything else I should be looking at? Also, is there an issue with installing u-joints "out of phase?"
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  #2  
Old March 20th, 2006, 11:09 PM
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Could also be unbalanced tires, look to see if any weights have fallen off.

Does it also happen with the truck stopped and in neutral?

-Hans
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  #3  
Old March 21st, 2006, 04:09 AM
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as well as the tyres have a look at the front and rear diff pinion bearings and the sliding joinys on bot propshafts
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  #4  
Old March 21st, 2006, 07:42 AM
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If you feel it in your seat it could be the rear tires, if you feel it in your feet it may be the front tires.

The drive shaft(s) may also need to be balanced.
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  #5  
Old March 21st, 2006, 08:16 AM
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Quote:
Originally Posted by johare
Hi, I've had my 95 ST D90 a little over a week now and I have a vibration that I can't seem to figure out. The vibration occurs when the vehicle is torqued i.e. accelerating, going up a hill, etc. I have replaces all 4 u-joints with only very slight improvement. I drove it with the diff lock engaged to eliminate the TCase and it did vibrate with the diff lock engaged. I'll be dropping each shaft next but in the mean time, is there anything else I should be looking at? Also, is there an issue with installing u-joints "out of phase?"
What speeds does it happen at? Take a look at the engine mounts and the tranny and tcase mount.
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  #6  
Old March 21st, 2006, 08:48 AM
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Thanks for the quick responses guys. I just had new tires put on and the vibration was there with the old tires as well. The vibe is only noticable starting at about 25mph and is present all the way up. The only time it subsides is on level ground and no accelerator. As soon as I give it gas the vibe is back. FWIW, the rear pinion seal was leaking when I bought it and the seller had that fixed however, less than 3 weeks later, the rear pinion seal is leaking slightly. I'll look into the above suggestions.
Thanks!
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  #7  
Old March 21st, 2006, 09:02 AM
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I'm having the same problem. I plan to do the same trouble shooting this weekend with regard to the UJ check and removing the front shaft check. Another trick i just heard of this morning from a guy that owns a shop specializing in Rovers (he does a lot of mods for off-roading) is if the problem is determined to be in the rear (after trouble shooting the front shaft) then he recomends trying adjustible rear links to see if that fixes the issue in the rear. If the problem is in the front then a double cardan front shaft is probably what we need. I hear Tom Woods makes stuff specifically for LR. You can google Tom Woods and email them. Measuring the shaft is key BTW.

I have a 97 with MD springs and disco spring isolators (gives a little extra lift but helps with road noise). The vib got worse last weekend when i installed a winch bumper and winch. Bringing the front down 1/4 inch actually made the probelm worse.

Like you it's fine when I let off the accelerator, but once I give it gas again the vib is right back.
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  #8  
Old March 21st, 2006, 12:40 PM
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Do you have lift? Also make sure that both front and rear links are tight.
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Old March 21st, 2006, 01:00 PM
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on topic - I have a 2" Rovertym lift with their rear trailing arms, GBR front drive shaft and I have significant vibrations around 50-65 MPH that I can't seem to get rid of. I took off the fron tshaft and had it rebalnced and while it was off drove it in diff lock and still had the vibrations.

I am thinking a 3-link might help with any castor problems in the front, but beyond that I have no idea. Any suggestions.
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  #10  
Old March 21st, 2006, 01:17 PM
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No lift.
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  #11  
Old March 21st, 2006, 01:57 PM
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Joe, if yo uhave CV DS make sure your pinion is pointing way up to the T-case. Yes a 3-link will solve your problem IMO.


Jay, since you don't have lift, and new u-joints just make sure everything tight first.
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  #12  
Old March 23rd, 2006, 04:18 PM
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Turns out the front wheel bearings needed repacking. The front left had quite a bit of play. We just got on the wrong track in trying to troubleshoot this thing and goes to show never overlook the simple things!
Jay
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  #13  
Old March 30th, 2006, 08:45 AM
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Vibration Persists

Well, I spoke too soon when I thought the front wheel bearings fixed it. While the repack did help quite a bit, but there's still is a significant vibration starting at about 30mph and really shakes at 50mph. I had the wheels rechecked for balance and they are fine. I've R&Red all U-joints and the shafts are in the proper phase. This weekend I plan on dropping each shaft and driving it to see if I can isolate the vibration the front or rear. we don't have a local resource to balance the shafts so I've tried to look at other causes first. Is there anything else I could be overlooking? My mechanic is about to send me to the dealer
Thanks,
jay
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  #14  
Old March 30th, 2006, 08:58 AM
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Did you check the engine mounts? How about the tranns and T-case mounts? It is also a good idea to check all the suspension components, just put a big wrench on everything and make sure it is all tight.
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  #15  
Old March 30th, 2006, 09:02 AM
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I have not checked those mounts yet - but will do asap. We did look at all the suspension components and all looks good there but yeah a good going over with a wrench would rule out something simple.
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  #16  
Old March 30th, 2006, 05:55 PM
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yeah, have a look at suspension components. Sometimes if panhard rod is loose you'll get shakes like that, but they generally don't come loose too often without a lift to exacerbate it. It is something to check though. Also check everything on and around the tie rods and steering stabilizer, check all the ball joints there. Good luck
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  #17  
Old March 31st, 2006, 02:56 PM
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Ok, I checked the suspension, engine mounts, tie rods, etc and all are tight. I dropped the front shaft - vibration still there.
I dropped the rear shaft - vibration GONE!
Aside from the shaft being out of balance, which I doubt, what should I look for. i noticed i can twist the pinion back and forth about 1/4 inch. Is that too much play?
Thanks,
Jay
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  #18  
Old March 31st, 2006, 04:01 PM
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Sounds about right for the play in the pinion. Are you sure the Ujoints are Ok in the rear shaft?
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  #19  
Old March 31st, 2006, 06:27 PM
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The u-joints are new, first thing we replaced. Slip yoke has no play either. I'm going to try reinstalling the rear shaft 90 cw from how it came off. BTW, the auto broker changed the pinion seal himself before delivery. Is it possible to tighten the pinion bolt too tight?
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  #20  
Old March 31st, 2006, 06:37 PM
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check to make sure the flange ends are clean and the mating surfaces don't have shit all over them. That would make the D-shaft sit funky.

Also check the rear suspension bushings and the upper A-arm ball joint for play... If they are worn, it could cchange your pinion angle and cause a case of the shakes...
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