Intense driveline vibration - JeepForum.com
 
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post #1 of 8 Old 08-21-2017, 07:26 PM Thread Starter
Mcktj97
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1997 TJ Wrangler 
 
Join Date: Aug 2017
Location: Grande Prairie
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Intense driveline vibration

Hi all, new to the site.
I'm hoping to add all kinds of before and after pics of my Jeep since I just finished it, but for now, I need a little help.
backstory:
replaced all brakes, wheel bearings, steering components, and tires. It had a wobble at 70km/hr before on the old tires, but I replaced them and the wobble went away ( they were WORN OUT)
I was putting it though its paces once I had it on the road and insured. At about 80km/hr-100 a very intense vibration comes on. You can feel it in everything, seats, floor, and the speedo flakes out (0-max, and back again)
I had it in the shop and was told that the rear pinion bearing felt like it was worn.
I rebuilt the entire rear D35, new carrier bearings, pinion bearings, axle bearings, seals, the whole meal deal.
STILL had that same vibration. I thought, meh, why not do the ujoints? So I replaced the rear ujoints. STILL have the vibration.
took the rear driveshaft off, it KIND of goes away, the vibration I feel now COULD just be the tires.
After some googling, I have gotten SO many mixed stories of what to check next.
My question is: Am I looking at a possible output shaft? I dont feel a ton of play in it as I push it side to side, (I dont know what to measure it in, im going to say probably 5 thou? ( I could be way wrong on that though) and it does turn side to side quite a bit (1/8 turn left to right)
Any help or suggestions on this would be greatly appreciated.


1997 TJ-2" body lift-2" spring lift-2.5L I4 5spd.
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post #2 of 8 Old 08-22-2017, 06:55 AM
biffgnar
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2006 TJ Wrangler 
 
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Please complete your profile so people understand how your jeep is equipped. This will help people answer you better.
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post #3 of 8 Old 08-22-2017, 07:01 AM
JimSmith
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1998 TJ Wrangler 
 
Join Date: Jan 2017
Location: Friendship Shores
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You should try removing the front driveline then drive it to see if the vibes go away. If not, get the Jeep up on jack stands or a lift and run it with and without the drivelines attached watching for anything that may be the cause.

'98 Chili Pepper 2.5, AX5, 33x12.5x15, 5.13, D30 Aussie, Super 35
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post #4 of 8 Old 08-22-2017, 07:20 AM
Shark_13
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1998 TJ Wrangler 
 
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^^
What they both said above...
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post #5 of 8 Old 08-22-2017, 06:24 PM Thread Starter
Mcktj97
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1997 TJ Wrangler 
 
Join Date: Aug 2017
Location: Grande Prairie
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So, interesting note:
I have driven it on a few high(er) speed runs, from 60 to 100km/hr back and forth a few times. Clutch in, clutch out, downhill, uphill, it all vibrates the same. Until! I engage the transfercase to 4hi.
Complete the 0-100km/hr run again, and it runs as smooth as a tj on 33's can be expected.
Could this be something in the tcase that's running at slack when not engaged, and vibrating, then when
Torque is applied, it tightens up??

1997 TJ-2" body lift-2" spring lift-2.5L I4 5spd.
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post #6 of 8 Old 08-24-2017, 08:25 AM
Andy-WhiteTJ
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Location: Poughkeepsie, NY
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Take the front drive shaft off and try again.

1998 White TJ with a whole lotta stuff...

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post #7 of 8 Old 08-24-2017, 11:46 AM
TJnBC
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2006 LJ Wrangler 
 
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take the shaft off and drive again. See if it goes away.

If it does, then inspect the Ujoints on the shaft. IF they are good , look at the front output on Tcase...step by step elimination

2006 LJR...the madness begins again
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post #8 of 8 Old 08-24-2017, 12:45 PM
Shark_13
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1998 TJ Wrangler 
 
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Location: Post falls
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When the CV and u joints locked up on my rear drive shaft, I honestly thought I had huge transmission or differential issues, it shook that badly.
I had it towed to a local 4x4 shop. They find the rear shaft need to be rebuilt.
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