| Author |
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rugger12
| | Posted on Friday, February 15, 2002 - 10:05 pm: | 
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Alright, I need some help. 96 D1. I have the wonderful mysterious driveline vibes. First, I had the tire balance checked...A OK. Then I took a look underneath, and my rotoflex was cracked to hell, torn all the way through at one point. Called Nathan, and got a roto...easy install, but VIBES ARE WORSE, I mean really bad now. I got back under, and redid the rotoflex, took it off, put it back on, torqued all the nuts down the same, etc. Any suggestions on what I should check next? I am losing it! Thanks in advance, Adam |
gp (Garrett)
| | Posted on Friday, February 15, 2002 - 10:10 pm: |
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man i wish i could help, but i was in the same boat just until a week ago. did the same thing you did and have the same truck. have an OME 1.5" lift. but one day the vibes just went away. weird stuff. sure its drive line related.....not tranny mounts or anything. maybe just give it some time like mine. hope for the best.
good luck. |
Adam Rue (Rugger12)
| | Posted on Friday, February 15, 2002 - 10:20 pm: |
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Thanks Garrett...my truck is totally stock...for now...How did your ome lift affect on-road ride? |
rugger12
| | Posted on Friday, February 15, 2002 - 10:46 pm: |
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How do I go about checking drive shaft balance? Can mechanic do this? Any sugestions in the Chicago area?
Thanks, Adam |
Ron
| | Posted on Friday, February 15, 2002 - 11:02 pm: |
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Any driveline shop should be able to check it. I am guessing that since you had the roto so badly cracked that you could have worn out the u joints on it. Take it off and drive with the diff locked using only front wheel drive (note: this test is the first thing to do in a vibe issue).
If the vibes are gone you have your issue. Take the shaft to a driveline place and they will be able to balance it and replace the u joint. You can DIY u joints if you are comfortable with that kind of thing.
Ron |
Randall Smith
| | Posted on Saturday, February 16, 2002 - 12:23 am: |
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Sometimes when I take my foot off the gas there is a humming vibration. The frequency of the vibration would be 3.5 times the engine rpm if it is the drive shaft...is this correct??
Tommorrow I am going to buy 4 u-joints, part# 344 at NAPA, which are about $25 each. I also have an appointment at the LR dealer in about a week for a sunroof rattle, so they will put the u-joints in for me. It's got to be a greasy job and they can do this in only two or three hours.
Randall |
muskyman
| | Posted on Saturday, February 16, 2002 - 12:51 am: |
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I agree with ron that removing each shaft is a great way to find a vibe problem .
but I'v found the first thing to do is lay under the truck while its parked in gear
while either you using your foot on a tire or a friend pushing from one end, rocks the truck forward and back violently.
you will be able to watch all the joints load and unload.
more often then not you will be able to see or hear(small click) the bad joint.
If the roto-flex looks good and none of the universals have any movement ,take a pry bar and flex the suspension components near there bushings looking for any undue loosness.
worn bushings can allow geometry changes in the axles that will cause vibrations due to inaccurate u-joint angles
of the 15 or so used disco's I looked at when purchasing mine I'd say 10 had some bushings in need of replacement. |
gp (Garrett)
| | Posted on Saturday, February 16, 2002 - 03:54 pm: |
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adam. adding the OME shocks and springs has been nice. there is a little more 'wander' on road, but that is easy to get use to. the ride is good and the control on all surfaces is better. i like it. switching to 235/85 16's soon.
smashed my rear bumper up nice last night after hitting a telephone pole. going to have someone local make me one. hopefully not too heavy to warrant getting OME HD's in the back.
i have the HD's spring up front and the MD's in the back. if you are going with an winch bumper get the HD's up front for sure. |
Kyle
| | Posted on Saturday, February 16, 2002 - 04:31 pm: |
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Its a god possibility you put the roto on backwards. If you do that you wil get bad vibes under throttle...
Kyle |
Jeff
| | Posted on Saturday, February 16, 2002 - 08:21 pm: |
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kyle, which way does the roto go? it looks like it can go both ways...
Jeff |
rugger12
| | Posted on Sunday, February 17, 2002 - 08:39 am: |
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Thanks Kyle, Ill reverse that roto and see if it helps...I cant thank you all enough for the help...I have saved a LOT of money by learning how to DIY on this site!!!You guys are the best! Adam |
Kyle
| | Posted on Sunday, February 17, 2002 - 11:55 am: |
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Need a pic to explain really Jeff. Looking at it I can tell ya but its hard for me to explain. The large voids should be on the power side going forward.
Kyle |
gp (Garrett)
| | Posted on Sunday, February 17, 2002 - 03:46 pm: |
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here is a pic of mine.
 |
gp (Garrett)
| | Posted on Sunday, February 17, 2002 - 03:55 pm: |
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damn that is small! nothing over 83kb would load. |
Moe
| | Posted on Sunday, February 17, 2002 - 04:23 pm: |
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Blue's pic of his worn rotoflex provides a little more detail.
 |
Moe
| | Posted on Sunday, February 17, 2002 - 04:34 pm: |
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No detail there, go to EE bulletin board and see for yourself.
http://www.expeditionexchange.com/discus/messages/2/291.html? |
Don13
| | Posted on Thursday, February 21, 2002 - 10:02 am: |
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This is somewhat documented on the Disco2owners board....I have a 2001 with just 6,000 miles on it and have the same problem. After getting zero help from the dealer I purchased from in NY I drove to Guilford CT on the advice of a board member. That dealer is great. 1st visit they replace the rear drive shaft. That help about 50% of the problem. I am going back again this month or next...still have a slow speed vibe. If you get the same symptoms as me perhaps my service exp next week will help if the dealer does get this figured out (and I trust they will they are great). Try this, put the gear selector in D3, speed up to appx 40mph,take your foot of the gas. Did you feel a jerky/not so smooth feeling as the truck slowed ? (no braking just foot off the gas). If you did you probably have the same problem as I. That feeling is what I get, using D3 and slowing just aids in the problem isolation because I can always recreate it. I didn't discover that till after my first repair at Guilford...so when we went for the post service test ride and I couldn't recreate the problem I drove home thinking it was all fixed. Now I have a test I can show the servicde team that will always produce the vibes. BTW I have a bone stock 2001 SE auto(no ace or performance package) stock tires are the wrangler HPs. I am waiting till I have close to 7500 to go back to Guilford so I can combine tha 7500 service visit with the warranty "vibe" help. I haven't set a service appointment yet but I promise to post an update right after the service when I do get there |
muskyman
| | Posted on Thursday, February 21, 2002 - 10:36 am: |
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don13,
IMHO...you have a bad u-joint somewhere
when you are in 3rd you allow for compresion braking.
when you accelerate you load the bad u-joint to the point its geometry changes slightly, like twisting a towel.
as you let off slowing the engine, the vehicle mass against the engine then twists the joint hard in the opposite direction past the center point and wraps its up the other way. this then pushes the geometry out the other direction.
as the geometry of the joint moves off of the center position it transfers power less effiecently in pulses instead of linear.this is the vibes you feel.
even on a brand new truck you can have a bad u-joint.
shafts are all tested and balenced in the manufactoring process. then the joints are added if you get a bad u-joint you get a vib.
nothing against the dealer ...i hope they fix your problem. but unless youv been banging around off-road the likelyhood of a bad shaft instead of the u-joint is slim.
IMHO |
Don13
| | Posted on Thursday, February 21, 2002 - 09:01 pm: |
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I had a high speed vibe that was pretty much 100% resolved with the rear shaft replacement. It's just the vibe that starts below 50mph (between 35 & 45 mph) that is still there. I have to look at the repair ticket to see if the ujoint (or is a cv joint)was replaced when they did the drive shaft.It's my wife's ride for the next two years and it won't see dirt till I get it....so no chance it incurred any trail damage. Either way after the first visit things are much improved. BTW The dealer service team all drive disco's, all modified for off-road use. They are very capable and were aware of some drive shaft production issues hence the better safe then sorry approach. I do appreciate the input, and I will be certain to ask about the ujoints/cv joints next trip. |
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