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Old 10-30-2009, 12:14 PM   #1
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Brand opinions needed

I am shopping a couple items, steering stabilizer and swaybar disconnects. I am leaning towards the JKS discos since they seem to be the fav among jeepers. What would be the best steering damper to purchase?

Also, I only have a 2"bb on it and am have slight driveline vibration from 28-33mph. What is the fix for this issue?

Thnx in advance,
Kevin

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Old 10-30-2009, 12:57 PM   #2
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JKS discos are fine. Steering damper-wise, most are pretty much the same. Rancho is good and what I'm running but those from OME, Skyjacker, Rough Country, Currie, Rubicon Express etc. are all pretty much exactly the same thing. Just make sure to not get a "generic" kit as it probably won't have the required tapered driver's side mounting bolt those kits made for Wrangler TJs include.

A slight drivetrain vibration after installing a 2" suspension lift is pretty common. You can get rid of it by dropping the transfer case skidplate about 1/2" with stacked washers between the frame and skidplate placed around each of the six bolts. If you have a 2003 or newer, you'll need longer metric bolts so enough bolt thread will be engaged. Don't delay getting rid of the vibrations, this is not one of those things you can just live with since those vibes can eventually cause premature seal, bearing, or u-joint failure.

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Old 10-30-2009, 02:02 PM   #3
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Thanks, it seems u do know a couple of things.

Is the vibe caused by the driveshaft rubbing on the skidplate? I noticed when installing the spacers that the shaft was resting on the skidplate when everything else was disconnected. If that is the case is there any problem with cutting a notch in the skid rather than lowering it to avoid sacrificing ground clearance?
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Old 10-30-2009, 02:07 PM   #4
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The vibe is from the slip-yoke on the rear output of the transfer case. It's not rubbing on anything, it's just from the angle change of the drive shaft from the lift. A small skid plate drop should eliminate it.
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Old 10-30-2009, 02:12 PM   #5
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Does it drop the whole t-case? cause i dont quite understand how dropping the skid will change the angle. Maybe Ill get it if I go take a look, but its pouring here right now.
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Old 10-30-2009, 02:20 PM   #6
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Yes, dropping the skid lowers the t-case as it's attached to the skid. This will lessen the angle of the drive shaft. You shouldn't have to drop it very far. Just pick up some thick washers from Ace or Home Depot and put them between the skid and frame.
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Old 10-30-2009, 02:23 PM   #7
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Nice, i luv cheap fixes!
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Old 10-30-2009, 02:29 PM   #8
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Cheap and easy. But when you go taller it would be wise to invest in a CV drive shaft and SYE.

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Old 10-30-2009, 02:30 PM   #9
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To add to this... the drivetrain vibrations are caused by the u-joint vibrating on the rear driveshaft due to operating at an excessive angle caused by installing a suspension lift.

Dropping the skidplate drops the rear of the engine/transmission/transfer case assembly (it is one long rigid assembly) which lowers the front of the rear driveshaft which reduces the angle at the very rear u-joint that bolts to the rear axle.

The engine/tranny/transfer case is mounted like a three-legged stool. Two engine mounts up front and one transmission mount in the rear between the transfer case and skidplate. Dropping the skidplate drops the rear of that assembly which steepens its angle which then better matches the steeper driveshaft angle caused by the suspension lift. That reduced angle difference between the driveshaft and rear axle then allows its u-joint to operate without vibration.
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Old 10-30-2009, 02:36 PM   #10
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Yeah that's exactly what I said! lol Thanks for the better explanation.
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Old 10-30-2009, 02:38 PM   #11
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I see, makes sense now. Would this, however, raise the front of the transfer case increaseing the angle of the front driveshaft? Im sure you wouldnt recommend it if it caused a probem like that, but it just seems like geometry.

Sorry for all the newb questions that im sure you have answered a million times. I did try searching, but the results did not contain a direct answer.
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Old 10-30-2009, 02:44 PM   #12
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Dropping the transfer case skidplate only lowers the mount that the rear of the drivetrain rests on. It raises nothing. Well that's not quite true, dropping the rear of the drivetrain raises the front of the engine & fan that is located in front of the engine mounts... kind of like a lopsided teeter-totter... but not enough to worry about.

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