| Author |
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Randall Smith
| | Posted on Friday, May 03, 2002 - 05:53 pm: | 
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This is a follow up to my previous post about unexpected driveshaft vibrations.
I have recently installed new third members and converted from 10 spline to 24 spline axle shafts. My RRC was a non-ABS with suffix "B" axles, so we had to swap hubs & spindles from an ABS truck so that the 24 spline axle lengths would fit. So in one day we swaped everything axle related except swivel balls.
Unfortunately it vibrates a lot now in the front, ruining my ride and causing embarrasment. When I remove the front drive shaft it is very smooth again. So imediatly we ordered a Tom Woods drive shaft which helped, but did not solve the real problem.
The people at the Rover Club House all thought that it was the transfer case, and not the axle conversion. So today they took the drive shaft off and showed me 1/8" play in the front output bearing. This explains everything and hopefully all will be well in a few days.
This is a 92RR with 115,000 miles. I have a 2" lift and did have humming noises in the drive train at 55/65 mph before the axle conversion.
Randall |
John Henley (Rexydog)
| | Posted on Saturday, May 04, 2002 - 09:58 am: |
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Textbook!!!!!!!!! So many people leap to the shafts, but I always look at that first. |
eignar
| | Posted on Sunday, May 05, 2002 - 05:31 pm: |
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I wouldn't bet a beer on that T-Box bearing....They generally are very sloppy...Post the results in a few days,.. |
hendrik
| | Posted on Wednesday, May 15, 2002 - 04:37 pm: |
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How long would it take to replace that t-box bearing ?
I just discovered the one in my rig is faulty.
It looks like a straigt-forward job, are there any pitfalls I should be aware of ...
Thanks and regards,
Hendrik |
Ali
| | Posted on Wednesday, May 15, 2002 - 06:52 pm: |
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My output front bearing has lots of play but no vibes. So I'm curious about the real culprit too!
Ali
'91RRC |
200 Tdi
| | Posted on Wednesday, May 15, 2002 - 11:58 pm: |
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My transfer case front output bearing is stuffed and so is the spline in the front drive shaft and the car (with 2" lift) is still smooth at 60 mph.
I doubt changing the bearing will fix your problem.
I'd start with the cheap things like wheel balance (has a weight fallen off)
John D |
hendrik
| | Posted on Thursday, May 16, 2002 - 04:13 am: |
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Thanks for the input - I was really suprised, that play is common in that bearing. I think I can rock the drive flange by at least 1mm(feels like that) in a radial direction i.e. up`n`down.
Wheel bearing play was adressed recently (to solve brake-rubbing, which is still there and due to one brake disc, ..... oh dear).
Wheelbalance was overchecked several months ago, and without off-roading since - I count that as o.k.
The driveshaft is not particular worn, but maybe my 2" lift is one cause for trouble.
I think I will first change the bearing, if the vibes are still there with the old driveshaft I will go for a CV-type d/s. And let you know.
regards,
Hendrik |
Randall Smith
| | Posted on Thursday, May 16, 2002 - 06:13 pm: |
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My front output bearing on the BW transfer case was replaced a few days ago. Aparently it was very dificult to remove from my truck. And unfortunatly did not cure my vibration problems.
Here's the weird part: I have since checked the output play many times trying to find out what is wrong. One third of the times I check, it has play, 2/3 of the times it does not. This may be normal and not induce vibration, or it may be a symptom of something deeper inside the transfer case.
So far using a Tom Woods double CV driveshaft and replacing the output bearing has helped, but not fixed the vibes. Only removing the driveshaft shuts off the bad vibes.
My next step will be to totally rebuild the front axle bearings, bushings, seals etc. If that doesn't work then I will try swapping diff assemblies again.
Randall |
doug james (Dgj95lwb)
| | Posted on Thursday, May 16, 2002 - 09:54 pm: |
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Just musing on your issue here,lurking I think they say.
What if the load of the front d/s is REACTING with the BW case, the vibe being internal to the xfer unit. A sympatheic vibe... Not that it is worn out or outta'justment. Just that throwin' parts doesn't seem to be solution. I don't mean that disparagingly either. Try removing the REAR shaft, leave front on obviously, and see if the vibe is there...just a shot. Easy for me to say.... cheers- doug |
hendrik
| | Posted on Friday, May 17, 2002 - 07:00 am: |
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Hmm.
Randall, what kind of play does your bearing have:
1) axial, 2) radial, 3) else
The bearing is a ball-bearing I think so it should not have any radial play - this allows the drive flange not only to revolve but to run on an "orbit" - if you guess what I mean (sorry, not that good in english I am - teacher always complained). Thats why I am so determined to replace it.
Axial play could have other causes and appear even with an intact bearing. Still not good.
May bearing by the way demonstrates play in all directions. |
hendrik
| | Posted on Friday, May 17, 2002 - 08:22 am: |
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ehhmmm, I forgot:
a little play is to be expected - but not in the bearing itself, more in the center diff -> because the short shaft (that the drive flange is attached to) is only a loose push fit in the center differential. That is where a little up and down movement is unavoidable (I counted this under point 3) ). |
Randall Smith
| | Posted on Saturday, May 18, 2002 - 11:28 pm: |
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Thanks to all.
Removing the rear drivshaft is on my list of things to try and find more clues, without spending more $$. Also will be trying another set of wheels soon just to make sure it isn't wheel balance.
Also when I get play in the TC drive flange; it is in all directions, and I sense that the looseness is about 6" deep into the trasfer case. The diff inside the TC may be worn, but how am I supposed to know??
Randall |
Ali
| | Posted on Monday, May 20, 2002 - 11:41 am: |
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Randall,
I know you're a bit frustrated by now as this is one of the toughest things to isolate. Is your vibe coming at decel when you take your foot off the gas? Should sound like GRRNK as they say in this board. If this is the case then it's UJ angle related. In order to improve this angle, try adding 100 to 200 lbs of weight to the front bumper to bring the nose down a bit. Practically, I don't know how to achieve this easily, perhaps using sand bags or something. This is easier if you have ARB/SG bumper though. After you do this, your vibes should go away since you improved your UJ angle. If not, it's time to look elsewhere I'm afraid. As another temp measure, you can try installing ARB castor correcting bushings to tilt your pinion higher. I know they're used to correct castor, but in your case you can use them to worsen your castor but correct your UJ angle. You're steering will go to shit but at least this way you can isolate your vibes better. I have a set of these used bushings if you want them.
Just some random thoughts! Good luck. |
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