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Unread 06-19-2007, 10:31 PM   #16
TrailWorthyFab
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I got a new CV joint my u joints were still good and a new yoke and balanced for 140. I don't know why you would have to pay any more than 25$ to have one balanced?

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Unread 06-19-2007, 11:02 PM   #17
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Yank the rear Drive shaft out. Throw it into 4 high. You are not going to need to get it up to 70 to find out if your shake is there. You should be able to tell out in front of your house at 30-40 mph if that. I strongly suggest against taking it up on the highway with your stock T case. But it won't take much for you to tell if that fixed it or not.

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Unread 06-20-2007, 08:35 AM   #18
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Ok well, a bit of an update. I drove it around a bit last night, and here's what I have. The vibe is a constant thing- no specific speed where it kicks on or off, but it is noticeable at about 20-25 and up. Below about 20, it's there, but very very faint. There is no difference between accel and decel- constantly there. Putiing it in to neutral while at speed did not help, so I think I can eliminate engine components factoring into it. I checked things underneath, and it all seems to be tight.

However, while driving some last night, I noticed that my steering wheel is shaking in my hand some. By the time I got back from the Rockies game last night, I was too tired to look again, but I think that might be a factor, so I will need to check all my front end components tonight for tightness...but is there anything else anyone can think of to check? I didn't get my DS pulled, so any balancing will have to wait until at least tomorrow.
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Unread 06-20-2007, 09:58 AM   #19
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That sounds EXACTLY like what mine was doing when the CV joint was bad. When I was under it checking the front drive shaft I had tuged on the rear shaft a little but not for long as I was sure it was up front because I could feel it in the steering wheel. When I put my jeep into N at a roll it was still there. Even at low speeds it was there but not as bad. If I'm wrong then never listen to me again but your deal sounds exactly like what mine was doing. You picked a good game to go to. Didn't they take it to the Yankees?
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Unread 06-20-2007, 10:17 AM   #20
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They ended up winning 3-1...was a good game. I'm trying to get tix to tomorrows game too, but I don't think I'll get them.
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Unread 06-20-2007, 10:23 AM   #21
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Quote:
Originally Posted by Toxic TJ
That sounds EXACTLY like what mine was doing when the CV joint was bad. When I was under it checking the front drive shaft I had tuged on the rear shaft a little but not for long as I was sure it was up front because I could feel it in the steering wheel. When I put my jeep into N at a roll it was still there. Even at low speeds it was there but not as bad. If I'm wrong then never listen to me again but your deal sounds exactly like what mine was doing. You picked a good game to go to. Didn't they take it to the Yankees?

My problem is that I don't have a CV on the rear shaft- it's just straight u-joints (not even a DC joint- no SYE). I've replace both the rear u-joints already, but still have the problem. Unless I'm thinking of the wrong part that you are talking about anyway...

But in any case, I was thinking about it on the way in to work today, and I want to check the tightness of the trackbar up front as well. If that's going out, it might be causing some of it. I also want to play with the t-case drop some more, and see if I can't get a better angle on the rear shaft. What's going to piss me off the most is that the fix is going to be one of two things- either a super easy, super cheap thing that I completely overlooked, or something ungodly expensive that I'll need to sell my left leg for.
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Unread 06-20-2007, 03:28 PM   #22
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Can you take a picture of your rear drive shaft where it meets your t case for me.

[IMG][/IMG]
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Unread 06-20-2007, 04:12 PM   #23
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This isn't my vehicle, but the pic is the same:



I don't have a slip yoke eliminator, and as such, I don't have a double u-joint (double cardon) joint at the end of the shaft/t-case. The driveshaft itself has the yoke going straight into the t-case, and joining the rest of the driveshaft with a single u-joint.
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Unread 06-23-2007, 05:35 PM   #24
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Update.

Ok, well, I got done messing with the t-case drop a little more- now it's sitting at about an inch drop. It definately helped the angle of the rear driveshaft, and it seems that vibe has gotten a little better. When at highway speeds, my teeth no longer chatter, but the vibe is still there. It seems to be more obvious at about 60mph (at least according to the speedo...it's probably closer to about 68-70). At lower speeds it is either not there, or has just been lightened so much that I don't feel it.

I am still feeling a shimmy in the steering wheel while driving though. While at speed, the steering wheel is shaking a bit in my hands...not a lot, but enough to let me know it's there. Could my rotors be so warped to cause this, or should I be looking elsewhere? The last time I checked the runout on my rotors it wasn't too bad, but this may have changed. The hub assemblies are both brand new, and everything is tight in the front end. I was thinking that perhaps a wheel might be bent or out of balance, but it didn't do this a month ago when I had to put the 33's on the TJ for an e-test. I'm flat out stumped. Any clues for direction?
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Unread 06-23-2007, 05:39 PM   #25
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SS okay? How about the bushings in the control arms? Sounds like everything's nice and tight, so should be okay. How's the steering linkage look? No slop?
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Unread 06-23-2007, 07:31 PM   #26
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Quote:
Originally Posted by FPKites
SS okay? How about the bushings in the control arms? Sounds like everything's nice and tight, so should be okay. How's the steering linkage look? No slop?

I'm assuming by SS you meant steering stabilizer. And if that's the case, then yes. The stabilizer is new....maybe 6 months old at best. The bushings in the control arms aren't new, but they are still in good shape from what I can tell. There's no slop in the steering anywhere that I can tell though. Everything is tight, and when the wheel is turned, no clunks or anything that I can hear that would lead me to something being a little loose.
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Unread 06-23-2007, 09:51 PM   #27
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I think you're down to rotors then...they can be warped and have perfect runout
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Unread 06-24-2007, 09:09 PM   #28
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Only if it happens while braking would I suspect the rotors.

Rotate your wheels and see if the vibration moves.
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Unread 06-25-2007, 08:41 AM   #29
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Quote:
Originally Posted by KUK9
Update.

Ok, well, I got done messing with the t-case drop a little more- now it's sitting at about an inch drop. It definately helped the angle of the rear driveshaft, and it seems that vibe has gotten a little better. When at highway speeds, my teeth no longer chatter, but the vibe is still there. It seems to be more obvious at about 60mph (at least according to the speedo...it's probably closer to about 68-70). At lower speeds it is either not there, or has just been lightened so much that I don't feel it.

I am still feeling a shimmy in the steering wheel while driving though. While at speed, the steering wheel is shaking a bit in my hands...not a lot, but enough to let me know it's there. Could my rotors be so warped to cause this, or should I be looking elsewhere? The last time I checked the runout on my rotors it wasn't too bad, but this may have changed. The hub assemblies are both brand new, and everything is tight in the front end. I was thinking that perhaps a wheel might be bent or out of balance, but it didn't do this a month ago when I had to put the 33's on the TJ for an e-test. I'm flat out stumped. Any clues for direction?
I still think that you are looking the rear drive shaft being the majority of the problem. I would take a torque wrench (yes i a torque wrench) and torque the wheels to spec. Believe it or not this could make a difference. But as far as your vibe in the rear you will have to step to a slip yoke and double cardon to fix this beyond where it is at as far as I know.

Later,

Don
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Unread 06-25-2007, 09:37 AM   #30
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Quote:
Originally Posted by KUK9
I've noticed it as low as about 30mph because I'm in it all the time, but other people can notice it at about 45mph, and it gets worst at above 55mph. It's a constant vibe, not a shake or DW. ??

My TJ had exactly what you are describing. No dw, just an annoying vibe. My constant vibe was from 20-30mph, but it seemed to go away after 30mph though.

Simple solution, SYE + DC driveshaft. It solved all of problems.
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