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Unread 07-23-2013, 04:38 AM   #1
Rjmklm
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1993 YJ Wrangler 
 
Join Date: Jul 2013
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93 wrangler vibration after lift

Hello all, great site, thanks to all for their questions and all the answers

I just bought a 93 wrangler, 6 cyl, 5 speed worth 31 tires. I put in a 2.5 rough country lift. After the lift, it felt like it was binding and difficult to get up to speed in any gear. Called rough country (RC) they suggested lowering the transfer case 1/4 inch. I did and it helped and I had the front aligned. But, I still have a shimmy in the transmission when I start in 1st gear, a vibration in 2nd, 3rd, and 4th gears during accel and deceleration. If the clutch is pushed in or put into netural, the vibration disappears.

Is this a u-joint, driveshaft or clutch problem


Thanks in advance for your responses.

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Unread 07-23-2013, 05:43 AM   #2
superj
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do search really quick for lift vibe and check out a few threads. i think tons of people had the same trouble but i don't remember what the usual trouble is.
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Unread 07-23-2013, 05:50 AM   #3
estrunk
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I had the same issue on my 95 YJ after installing the same lift. I'm guessing that you got closer to 3" of lift. If that happened you will need to install a slip Yolk Eliminator and new rear drive shaft. As soon as I did this the vibration stopped.
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Unread 07-23-2013, 06:38 AM   #4
Rjmklm
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Where did you buy the yoke and shaft
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Unread 07-23-2013, 07:03 AM   #5
UZI4U
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Search SYE and everything about it will pop up.
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Unread 07-23-2013, 08:15 AM   #6
jokerchief462
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Go to Tom Woods home page and halfway down right side grey banner labeled Technical Information and Sponsors. Open that and start reading. It has more than you want to know about drive shafts and pinion angles.

Pay close attention to two pictures of the drive shady angles.

Without an SYE and double cardon joint shaft your pinion angle is level with the T-Case. With your lift kit I bet you had wedges on the rear springs which have you pinion angle up.

Get a magnetic angle finder at a hardware store and figure out what you have and then go from there.
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Unread 07-23-2013, 10:41 AM   #7
kahanabob
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post a pic of your driveline angles if you can. 1/4" TC drop is not much, 1" is standard. did you install any shims on the rearend?
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Unread 07-23-2013, 02:44 PM   #8
cojab
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Before you get the SYE check your drive shaft angles. Your transfer case yoke and rear pinion yoke angles should be the same. You can correct that with shims. (get steel ones not aluminum if you need them) Also double check to make sure your yokes on the driveshaft are timed correctly (in line with each other. not sure how else to describe that) That can cause vibrations as well.
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Unread 07-23-2013, 06:28 PM   #9
Rjmklm
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1993 YJ Wrangler 
 
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Location: Spring hill, Florida
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I spoke with Eric at SBC today, he gave great advice and I made all the suggested checks. Then I lowered the t/c to a total of 1/2 inch and the yoke is back in the original position. Test drive was perfect. Thanks to all that posted.
Regards, Rod

Looks like SBC will be my vendor in the near future.
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