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Old 06-28-2011, 07:13 PM   #1
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drive shaft info for a newbie

ive got a 99 tj 4.0 with a 4in. lift. it shakes pretty bad pulling out the gear shifter goes crazy after that its ok.i just bought it a month or so ago.ive replaced the trans mount track bar steering box.im wondering can i put in a cv drive shaft to take care of the shake.i dont plan on wheeling it.so no sye at least not now.also it does have tc drop. no body lift at all.if im leaving out any info just let me know.thanks.

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Old 06-28-2011, 07:36 PM   #2
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So you have two problems, a shifter that moves side-to-side when you first start out, and a vibration from the drivetrain you feel up through the seat of your pants?

If the shifter moves side-to-side as you get on/let up on the gas pedal, that is often caused by a broken motor mount from the engine lifting up off and then setting back down onto the broken motor mount.

Yes you can install a CV driveshaft to cure the drivetrain vibration caused by the 4" suspension lift, but you'll also need a SYE kit and adjustable upper control arms to get that CV driveshaft working properly.

Instead, you could install a set of 1" taller motor mounts like from Brown Dog (use his rubber, not poly mounts) which works like the t-case drop does. Installing the 1" taller motor mounts would be like adding another inch to the t-case drop. That would probably be enough to stop the vibes from a 4" lift. No guarantee but probably. If not quite, you can always drop the t-case another half-inch with washers. Of course the SYE/CV-Driveshaft/Upper Rear adjustable length control arms is the right way to cure those vibes which would also allow you to get rid of your present 1" t-case drop.

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Old 06-28-2011, 07:46 PM   #3
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hey thanks for the fast reply.when i checked the trans mount it was torn in half i just knew that would take care of it.nope.then i thought of motor mount but no luck they are perfect.thanks for the advice on the mml.by doing this will i just have to worry with the fan shroud or is there any thing else.id like to go all out and do the sye but if i spend much more right now i might end up on the couch.lol
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Old 06-28-2011, 07:53 PM   #4
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Still be wary of the motor mounts, they can often look perfect but be broken. I had one that looked fine but upon closer examination by pushing up on the engine gently on both sides with a jack, confirmed that one was actually broken.
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Old 06-28-2011, 08:06 PM   #5
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yeah i did put a jack on each side i really hoped that was it.i even got my dad to check at his house,he knows more than me,but no broke mount.he nor i are at all use to lifted jeeps.if this helps he said it acts like no one resurfaced the flywheel when they changed the clutch.it was put in just before i bought it.thanks again
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Old 06-28-2011, 09:46 PM   #6
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I had the shakes and vibrations after my lift install with sye an cv shaft. I installed some adjustable rear upper control arms from ironman 4x4 fab and the Jeeps runs like new. These control arms are pure beef as well.

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