| Author |
Message |
    
Craig McLaughlin (Cmclaugh)
| | Posted on Saturday, December 28, 2002 - 08:34 pm: | 
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I have a 96 Disco with the ever present driveline vibration problem at around 70 to 80 mph. My Disco is bone stock, excluding the rear driveshaft, which was replaced with a non-rotoflex type in an effort to cure the vibration. It didn't!
At the Dealers recomendation, I had the rear diff rebuilt as they diagnosed a bad ring and pinon. During the same visit they verified all driveline angles were within spec.
I've subsequently checked and replaced any suspect suspension bushings and inspected the front driveshaft for worn u-joints and slider. Everything checked out okay.
Tires are new, wheel bearings are within spec, and the shocks are brand new Bilsteins. Everything within the scope of my ability seems fine.
Am I even looking in the right places? Could the vibration be internal to the transmission or transfer box? How would one know for sure?
I know a bunch of you have experienced similar driveline vibration woes related to taller springs and the like. How is it at stock ride height I have to put up with this crap?
How many D1's came off the showroom floor with driveline vibrations I wonder? |
Axel Haakonsen (Axel)
| | Posted on Sunday, December 29, 2002 - 10:44 am: |
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Are you sure the vibration is coming from the rear? Have you tried dropping one driveshaft at a time then locked the cdl to determine which one may be causing the vibration?
What about the wheels, are they balanced? Uneven wear? Have you tried rotating the tires to see if the vibration moves? Replaced the wheels one at a time with the spare? You need to locate where the vibration is coming from before you can fix it. It can be a pain in the ass to find, though... |
Craig McLaughlin (Cmclaugh)
| | Posted on Sunday, December 29, 2002 - 02:46 pm: |
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I haven't dropped a shaft yet. The vibration is definitely not from the tires/wheels. It's a coarse vibration from the middle of the vehicle right under the center console. A loud resonance also accompanies the vibration.
I am not really sure if the vibration is coming from the rear or not. Before I switched the rear driveshaft to a non-rotoflex type I was experiencing the same vibration problem around 60 mph. Now with the new shaft the vibration has jumped up to 75 mph.
Say I drop the front shaft and the vibration goes away. Does that automatically mean the front shaft is causing the problem? I would hate to spend the money to replace the front shaft and still have bad vibes. |
Eric N (Grnrvr)
| | Posted on Sunday, December 29, 2002 - 04:08 pm: |
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no it doesn't mean that. I have the same problem and have used regular shafts, double cardon shafts, and double double cardon shafts and I still have the same problem. I have tried and checked every thing except for the transfer case.. Even the transfer case bearings don't have any play in them. So who the hell knows. I had given up on it a while ago and just learned to live with it. When mine was stock it acted funny when going from 50mph to about 57-60mph. Now at about 74mph it starts to vibe and rumble up to about 85 mph.. It seems that with me the change in tire size causes it to happen at different speeds. IE 265/75s and it starts at 74mph, I run 225/75 and it starts at about 65mph.. I figure my transfer case is a piece of shit but, it keeps working so I'm going to run the thing into the ground. I guess I'll find out what is really wrong once the culprit blows up while going down the road cause I (and other people that have tried to figure it out) can't find an issue that could be causing it. |
Craig McLaughlin (Cmclaugh)
| | Posted on Sunday, December 29, 2002 - 09:44 pm: |
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With the number of years the Discovery has been in production I find it hard to believe Land Rover, its engineers, dealers and service technicians have no solid advice on the matter.
I also find it difficult accept the fact that this is something I'll just have to live with. I don't expect Lexus like smoothness from my Discovery but do expect to be able to travel at highway speeds without the fear of the driveline exploding.
I know there are other D1 owners out there with the same frustration I have. Without getting rid of an otherwise good vehicle, there must be a solution to the problem.
Thoughts anyone...? |
Mike B.
| | Posted on Monday, December 30, 2002 - 12:51 am: |
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Check your motor mounts. Have someone get inside with vehicle with the motor running, in drive, and the brakes set hard. While standing to the side (in case the vehicle lurches ahead), have them step on the gas. If the engine rotates then you have a busted motor and/or transmassion mount.
Thanks,
Mike B. |
Corey Shuman (One_Bad_Rover)
| | Posted on Monday, December 30, 2002 - 01:15 am: |
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Just an idea but did you actually take your front driveline off?? I had a nasty vibration that could not be found for nuthin, finally on a whim we took the front driveline off, even though it seemed tight and solid. However as soon as it came down the ujoints just fell apart. Might be worth a check...Good luck!! |
Craig McLaughlin (Cmclaugh)
| | Posted on Monday, December 30, 2002 - 11:10 am: |
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The motor/transmission mounts are definitely suspect - the engine mounts especially. I'll be replacing them shortly.
As far as the front shaft is concerned, I haven't dropped it yet. I've done the large screwdriver thing with the driveline relaxed checking for play between the spiders. No movement not even a click.
As far as driveline vibrations are concerned is the front shaft on the Discovery more suceptible? I also noticed the u-joints are out of phase. Does this make a difference? |
Eric N (Grnrvr)
| | Posted on Monday, December 30, 2002 - 11:23 am: |
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It's my understanding that being out of phase actually helps the shaft from getting vibes. Of course it all depeneds on angles and how much phase and a whole cast of other things that I can't explain nor do I know the facts about. I have done the drop the shafts thing and when there was only one on the truck at a time it was all nice and smooth but, when you put them both on again and run them at the same time is when it would get crappy again. Though it may help you, it did nothing for me. I'm not saying it's a waste of time but, don't get your hopes up. |
Jess Brandt (Disco285)
| | Posted on Monday, December 30, 2002 - 11:32 am: |
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now i'm not positive on this...but if there is a loud noise coming from directly under the center console...this would probably be the center muffler...i had some issues with a lose heat shield above that muffler...it was hitting the driveshaft...and later i punctured it...which led to the noise....just check it out...
peace |
PJKBRIT
| | Posted on Monday, December 30, 2002 - 11:33 am: |
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My 02c....definitely do those motor mounts and the mounts around the •••••• and transfer case. Also, I found improvement on my 94 by re-torquing the rear pinion bearing bolt,(remove rear shaft aft joint) and by using a NEW rotoflex coupling. ALSO...thorough regreasing of ALL the driveshaft UJs with a good grease gun and NEW grease nipples will help.....don't give up mate! |
Rob Davison (Pokerob)
| | Posted on Monday, December 30, 2002 - 12:14 pm: |
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http://www.lrfaq.org/RR/LR.Service.bulletin.8.86.html
that's a pretty good list of shit to check.
rd |
Craig McLaughlin (Cmclaugh)
| | Posted on Monday, December 30, 2002 - 12:44 pm: |
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That's a huge list alright. Does the front shaft t-case joint and the rear shaft t-case joint need to be in phase? Is that even possible? How are the shafts positioned relative to each other on later model non-rotoflex D1's?
In general how common is driveline vibration on D1's? Has anyone had the dealer succesfully diagnose and fix a vibration problem? $80 plus bucks an hour can get expensive real fast, especially if the dealer can't diagnose the problem. |
Kelly Fristoe (Kfristoe)
| | Posted on Monday, December 30, 2002 - 03:10 pm: |
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I think I know what your problem is. My 2000 DII was doing the same thing. I found out it was my radio. That's right, my radio. To fix it all you have to do is turn the volume knob up to a higher volume and the vibration noise seems to go away. Try it. |
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