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Unread 08-30-2010, 01:01 PM   #16
crusty1007
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Remove the rear DS & drive it in front wheel drive. See if it goes away.

FYI the vehicle is going to handle differently.

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Unread 08-30-2010, 02:02 PM   #17
Stang5lgt
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Quote:
Originally Posted by Unlimited04 View Post
rear pinion seal is leaking like crazy too.

ideas? rear shaft balance? pinion bearing preload?
Well the seal that came with your install kit was not the same as the one I removed so I wondered if it would be a leaker. The rubber was touching but didn't seem snug against the yoke. Pinion bearing preload won't give you vibes just makes noise. I wonder if you have a u joint going bad in the rear shaft. We will check it out when you get here.
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Unread 08-30-2010, 07:51 PM   #18
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had the front driveshaft balanced - that definitely wasn't the problem.

pulled the rear shaft and having it rebuilt & balancede at the driveline shop...new non-greasable u-joints, centering ball and fixing slight play in the slip shaft.

very little vibration with the rear shaft removed...so hopefully that was the issue!

and Josh (Stang5lgt) installed a new rear pinion seal

hopefully i'll be good to go for labor day weekend wheeling
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Unread 08-30-2010, 09:53 PM   #19
Stang5lgt
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So I take it the new seal didn't leak. LOL Good deal.
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Unread 08-30-2010, 10:28 PM   #20
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Originally Posted by Stang5lgt View Post
So I take it the new seal didn't leak. LOL Good deal.
honestly, i didnt even look.
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Unread 09-01-2010, 06:10 PM   #21
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ok...

Rear drive shaft is rebuilt & balanced.
Rear output yoke wasn't torqued properly. Set to 150 ft-lbs per AA install manual.

Rear pinion seal still leaking, not quite as bad this time.

Vibes are still there when rear shaft is installed. Obviously related to rear, since removal of rear shaft eliminates them.

Next idea?

Other than this mystery vibe @ 60 mph and greater, the Jeep drives freakin' amazing.
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Unread 09-01-2010, 06:24 PM   #22
Stang5lgt
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Quote:
Originally Posted by Unlimited04 View Post
ok...

Rear drive shaft is rebuilt & balanced.
Rear output yoke wasn't torqued properly. Set to 150 ft-lbs per AA install manual.

Rear pinion seal still leaking, not quite as bad this time.

Vibes are still there when rear shaft is installed. Obviously related to rear, since removal of rear shaft eliminates them.

Next idea?

Other than this mystery vibe @ 60 mph and greater, the Jeep drives freakin' amazing.
If the rear axle isn't making any noise it shouldn't be the problem. I would get a timken seal I think Autozone has them. I have had good luck with those. If it was the rear axle I think you would have still noticed it when the shaft was off. Try taking the shaft and rotating it 180 degrees at one of the yokes. Mustang guy I know has to put his rear shaft on the same every time otherwise he gets vibes.
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Unread 09-01-2010, 07:23 PM   #23
mrblaine
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Quote:
Originally Posted by Unlimited04 View Post
ok...

Rear drive shaft is rebuilt & balanced.
Rear output yoke wasn't torqued properly. Set to 150 ft-lbs per AA install manual.

Rear pinion seal still leaking, not quite as bad this time.

Vibes are still there when rear shaft is installed. Obviously related to rear, since removal of rear shaft eliminates them.

Next idea?

Other than this mystery vibe @ 60 mph and greater, the Jeep drives freakin' amazing.
Make some small adjustments to the pinion angle and see if it changes anything.

Also, make sure you don't have a control arm in a bind. On level ground, you should be able to loosen the upper bolts at either end and put a jack under the pinion and raise it very slightly until you can spin the bolts by hand. If you can't, make it so.

After you do that, take it for another drive.
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Unread 09-01-2010, 09:01 PM   #24
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Sorry you can't get this pinned down, Unlimited! Hope you can figure it out.

I'll throw a WAG in the hat: didn't you install a new tcase? Would a bent rear output cause this? Or something related to the tcase? I have no idea if this would cause what you were experiencing. Just wanted to throw it out there.

Good luck man!
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Unread 09-06-2010, 08:48 PM   #25
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still vibrating. starts being barely noticable around 55mph...definitely pronounced by 60mph, then very obvious by 70mph and increases in amplitude as you go faster. it vibes enough to shake the rearview mirror like a set of 12" subwoofers. i can also put the tranny in neutral on a downhill (maintaining speed), and it still does it, absolutely no change.

I played with the pinion angle, between 1 down to 0.5 up. loosened the UCA's, LCA's, loosened the tranny mount, all retorqued to spec & no binding.

At this point I'm at a complete loss. The diff makes no unusual noises, sounds just like stock. TrueTrac works like a champ. Maybe it's just a "Jeep thing"??
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Unread 09-06-2010, 09:31 PM   #26
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Hey 04, I feel your pain I am sure you are following the other thread on driveline vibe by AZjeepnewbie, I have spent alot of time on this and I am done screwing with this and am going to enjoy my rig. The 5.13's are worth it.
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Unread 09-06-2010, 09:47 PM   #27
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Wow, hadn't seen this thread before. Probably the same issue as popeyesides and me. With 5.13s, we're running driveshafts at 4,000+ RPM that are only balanced to 2,000 or maybe 2,500 RPM. I'm looking into high speed balancing options. There are shops that will balance shafts at up to 10,000 RPM. Stay tuned for another episode of "As the Driveshaft Turns".
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Unread 09-06-2010, 10:05 PM   #28
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Quote:
Originally Posted by AZJeepNewbie View Post
Wow, hadn't seen this thread before. Probably the same issue as popeyesides and me.
I see you guys both have 42RLE's....maybe this is another added benefit of the steep OD ratio?

btw, mine isn't all that RPM dependent...3rd gear, 2nd gear, or OD...doesn't seem to make much difference, although its hard to tell when screaming the engine at 3200+ RPM in 3rd at 65+mph
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Unread 09-06-2010, 10:20 PM   #29
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Quote:
Originally Posted by Unlimited04 View Post
I see you guys both have 42RLE's....maybe this is another added benefit of the steep OD ratio?

btw, mine isn't all that RPM dependent...3rd gear, 2nd gear, or OD...doesn't seem to make much difference, although its hard to tell when screaming the engine at 3200+ RPM in 3rd at 65+mph
No, it won't be engine RPM related at all. Tranny gears would make no difference either. It's strictly a tire size versus differential gear ratio issue. That's what dictates your driveshaft speed.
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Unread 12-17-2010, 01:38 AM   #30
cpleasant
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I've been chasing mine for years. 02 manual with 4.10's and 2" BB. New front axle and control arms did help some, but that's only because the pinion nut had lossened. Plling the front ds lessens it, but that it seemingly only because the front is acting like a conductor to the entire vehicle through the front axle/steering. Pulling the rea ds seemd to help alot, but that was before the front axle change so it needs to be done again.

I'm currently getting a cheap used rear ds to see if it changes anything. If not I'm going to try some adjustable rear control arms.

In all, I'm in the same boat as you.
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I know your rite I seid the dealer seid the same thing as you and that I don't want them there , but I was asking another qeustin as in what do I do about the slots in the brackets couse if I just put a bolt in there it will slide back and fourth but again thank you all knowing and powerfull jeep god sorry us lesser jeep peeons might have some more qeustins in the future , so please if there to much for you sit back relax go to the next post
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