| Author |
Message |
    
Brent
| | Posted on Tuesday, August 13, 2002 - 09:24 pm: | 
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My 95 Disco has developed a vibration problem. It starts vibrating at about 30 mph and gets progressively worse as speeds increase.
I checked the archives and they all seem to point to ingnition and speed sensor. My ignition (cap, rotor, wires, plugs) only has about 1000 miles on it. The engine has plenty of power. The vibration seems to be speed related not rpm related. If I put it in neutral at any speed it almost completely goes away. Does this rule out the speed sensor? Also, the drive shafts both seem solid; no play at all. Someone told me it's the t-case. Does that make any sense? Thanks in advance. |
Brent
| | Posted on Wednesday, August 14, 2002 - 06:37 pm: |
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Anyone have any ideas? |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 07:04 pm: |
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feel it in the steering or in the seat of your pants?
your 95 have a rotoflex coupling on the rear driveshaft?
driveshaft properly lubed?
all 3 diffs have good fluid?
tires properly inflated & balanced?
more prone to vibe at 30mph accelerating uphill or same vibes accelerating downhill? |
Brent
| | Posted on Wednesday, August 14, 2002 - 07:21 pm: |
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Vibration in seat of my pants.
I do have rotoflex. Looks ok. Tuged on it; seems solid. Is there a better way to check?
Fluids all changed last month
Tires good.
More prone to vibrate going uphill.
Thanks! |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 07:37 pm: |
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any recent suspension changes?
you confident that the fluid change was done properly? |
Kyle
| | Posted on Wednesday, August 14, 2002 - 07:38 pm: |
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Check that damn front UJ nearest the T case. It will do that and the payoff is pretty rough...
Kyle |
Brent
| | Posted on Wednesday, August 14, 2002 - 07:44 pm: |
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I do have OME heavy springs but I've had them a while. I changed the fluids myself. I pretty confident but is there one I should check? I tugged on the driveshaft and there was no play; Is there an better way? BTW, with my boat in tow it is much worse. |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 07:57 pm: |
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roto is doin the rubber dance under load. ujoint(s) may be about to give up the fight too. Do you hear any chirping when you cruise? |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 07:58 pm: |
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and as far as fluid change goes, if you used the right fluids and you put the right amount in, there shouldn't be a problem. Did you change to synthetic or anything different from before? |
Kyle
| | Posted on Wednesday, August 14, 2002 - 08:05 pm: |
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You want to check the joints with all teh stree off of them (Trans in "N" sitting on flat ground , parking brake off..
Kyle |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 08:15 pm: |
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is replacement uj Napa part # 344 or 369 or somethin like that? |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 08:16 pm: |
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I'll bet his roto has been suffering from the lift for a while and it's gone terminal. LOL, pulling a boat adds insult to injury. |
Blue (Bluegill)
| | Posted on Wednesday, August 14, 2002 - 08:16 pm: |
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you ever lock it up in 4-low and get busy? |
Brent
| | Posted on Wednesday, August 14, 2002 - 08:27 pm: |
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Just found my mistake : I was checking the drive shafts on my sloped driveway. They sure felt solid under that load. Pulled into the garage and the front tcase u-joint is pretty sloppy. Rear still seems solid so I'll change the fronts out first and take it from there. It's funny that it never did this in 4low. I'm offroad three days a month and I run 265/75s. Anyway,Thanks for all your help! |
Blue (Bluegill)
| | Posted on Thursday, August 15, 2002 - 11:55 am: |
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well, if you use that Disco in 4-low, and you're running 265's, that's just more load placed on that rotoflex. |
Brent
| | Posted on Thursday, August 15, 2002 - 02:41 pm: |
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Blue
I know that the rotoflex will go soon. What's the best way to go on this? Conversion kit from AB? I've heard metion that some RR Clasic shafts will work? |
Blue (Bluegill)
| | Posted on Thursday, August 15, 2002 - 03:01 pm: |
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a lot of people have already done the conversion from roto to ujointed shaft, and a few of us are working on this right now. I'm sure a good tech article complete with description, pictures, sources for parts, costs, etc will be written within the next couple weeks. |
gp (Garrett)
| | Posted on Thursday, August 15, 2002 - 03:54 pm: |
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the part # for the U joint is #344 from Napa. cost is $25 a piece. |
Kyle
| | Posted on Thursday, August 15, 2002 - 04:05 pm: |
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Something that hasnt been touched on. If you are going from a lifted truck with a non vibrating Roto setup to and U joint setup , your Vibe probability is pretty high.... Your pinion angle wont be right for the joint/joint setup....
Kyle |
Blue (Bluegill)
| | Posted on Thursday, August 15, 2002 - 04:31 pm: |
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in that case, can pinion angle be tweaked enough by tightening trailing arms? |
Bill Bettridge (Billb)
| | Posted on Friday, August 16, 2002 - 01:31 pm: |
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Blue,
You might be able to shim the stock arms to change pinion angle - but the threads are not that long on the stockers and the nuts are already tightened as far as the threads allow.
(ie: the threads don't extend through the bushings)
Bill |
ButchS
| | Posted on Friday, August 16, 2002 - 07:35 pm: |
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I noticed after changing axle fluid, the (front)offset pumpkins is angled about 10 degrees. I have hd OME springs and bilstein shocks. Spring is somewhat created the angle. Front half shaft is angled too pointing upward (undetermined slight degree) AND WORST its making a grinding sound cruising 50 to 60 miles during deceleration, mostly, downhills. Any fixtips is highly appreciated. |
Andy Goode
| | Posted on Saturday, August 17, 2002 - 12:26 pm: |
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Brent
I am experiencing the same after install of OME HD springs. Front axle is angled forward instead of up&down. And I swear I can hear it whining or grinding when driving. I can feel some driveline vibrations at times. Should this be corrected? |
ButchS
| | Posted on Thursday, August 22, 2002 - 08:29 pm: |
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Just wondering how the axles moved such an angle after upgrading springs and shocks. The trailing arms got two bolts to hold the axles. I guess the springs changed the geometry of the steering components making it look wierd and produce annoying sounds. Playing dirty this weekend to straighten front shafts and pumpkin. |
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