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Old 02-05-2012, 03:08 PM   #1
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2.5" lift, will it need vibe correction?

I'm leaning toward the Rough Country 2.5" coil/shock lift. My buddy has this on his Rubicon and the ride seems pretty decent for the price.

My question is: His Rubicon didn't need the TC drop although it's included in the kit. Will my X 4.0 5spd need the TC drop or is it one of those things that you don't know until you try it???

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Old 02-05-2012, 06:19 PM   #2
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Depends on your Jeep... every one is different... the Rubicon has a double cardin rear shaft and a fixed yoke... all others are normally a slip yoke and single u-joint application. At 2"... I got vibes and corrected it with a MML.

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Old 02-05-2012, 06:25 PM   #3
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I am getting a little vibration around 30 mph with my 2" so gonna drop the t case.
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Old 02-05-2012, 10:06 PM   #4
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So if the TC drop that comes with the kit doesn't alleviate any vibes that may pop up, a MML will take care of it????
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Old 02-05-2012, 10:12 PM   #5
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please reconsider the RC lift..i have it ...loved it...then came to my senses, replacing this summer...it may ride "decent for the price" but the shocks are not the correct length for the lift and bottom out unless you bumpstop the crap out of it...rc's lift is 300 bucks...save up 3 or 4 hundred more and get a better lift..i am looking at the RCD (race car dynamics) 3" lift that comes with bilstein 5100 shocks which are unanimously voted 1 of the top 3 shocks you can get (bilstein, ome, rancho adj)...also there is the OME 2.5" which is one of the best riding lift you can get..its only like 7 or 8 hundred bucks..if your gonna spend 300 on a lift you can wait and save up 4 hundred more
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Old 02-05-2012, 10:35 PM   #6
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Realistically, I drive in town and on the highway.. I seriously doubt I will make the suspension travel enough to even hit stock bumpstops... Really I'm that "lightweight" on the offroading...
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Old 02-06-2012, 06:13 AM   #7
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If you drive 99% of the time on pavement... you are still better off saving for the OME 2.5" if not just for the ride quality... I wouldn't want to lift my Jeep and have it beat me up just driving down the road.... do you?
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Old 02-06-2012, 07:12 AM   #8
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i have that lift and needed an alignment to fix the death wobble. i did not need to use the tc drop kit though.
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Old 02-06-2012, 08:02 AM   #9
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Quote:
Originally Posted by I-Want-A-Jeep View Post
Realistically, I drive in town and on the highway.. I seriously doubt I will make the suspension travel enough to even hit stock bumpstops... Really I'm that "lightweight" on the offroading...
you won't hit the stock bumpstops because you'll bottom out the shocks first and eventually break them.

the reason you extend the bumpstops is to prevent shock damage and suspension interferences.

don't assume anything, you need to verify the clearances at full bump while installing the lift, and adjust the bumpstops as necessary. FWIW, you will use your bumpstop extensions a lot...speed bumps, dips, potholes, etc.
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Old 02-06-2012, 09:07 AM   #10
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Quote:
Originally Posted by TnDz TJ View Post
the Rubicon has a double cardin rear shaft and a fixed yoke... all others are normally a slip yoke and single u-joint application
This is not completely true. The Rubi has a fixed flange and a 2 joint slip driveshaft. Rubi's still have to buy CV driveshafts when lifting.

Quote:
Originally Posted by thetoadLJ View Post
i have that lift and needed an alignment to fix the death wobble. i did not need to use the tc drop kit though.
Any suspension lift will require you to get an alignment. As they all will change your toe alignment with our inverted Y steering. And even if they came with control arms they won't be exactly right on every Jeep and you will have to have your castor adjusted.



I had a 2.5" lift and didn't have vibes. Also wany to point out a better product for fixing vibes. The UCF LOPRO mount. It mounts the t-case 1" lower in the skid. This will work much better than a MML as your lifting the motor 1" and just barely lowering the t-case. Granted that this is enough for most small lifts.
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Old 02-06-2012, 06:39 PM   #11
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Quote:
Originally Posted by thetoadLJ View Post
i have that lift and needed an alignment to fix the death wobble. i did not need to use the tc drop kit though.

Sounds like you may need adjustment cams for the front LCA's...



And I was just making an analogy on how easy I am on a suspension by saying I probably wouldnt hit even stock bumpstops... of course I'll put on the ones with the kit..
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Old 02-06-2012, 09:24 PM   #12
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Quote:
Originally Posted by I-Want-A-Jeep View Post
Realistically, I drive in town and on the highway.. I seriously doubt I will make the suspension travel enough to even hit stock bumpstops... Really I'm that "lightweight" on the offroading...
i went over a bump in the road about 2 days ago going 25mph and heard a loud THUD...bottomed my rear shocks out.....happens allll the time
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Old 02-07-2012, 06:25 AM   #13
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Quote:
Originally Posted by TheTJRod View Post
This is not completely true. The Rubi has a fixed flange and a 2 joint slip driveshaft. Rubi's still have to buy CV driveshafts when lifting.
You are correct, sir.... I misspoke and cannot edit my post... DANGIT~! I had to check my bud's 06 Rubi Unlimited..... sigh.... I was misled at first... thanks for setting me straight.
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Old 02-07-2012, 03:11 PM   #14
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Quote:
Originally Posted by Wrangler06 View Post
i went over a bump in the road about 2 days ago going 25mph and heard a loud THUD...bottomed my rear shocks out.....happens allll the time

Like I said, it was just an analogy...
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Old 02-07-2012, 03:23 PM   #15
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My TJ had the slightest little vibe when accelerating when I did my first mod. A 2.25" Budget Boost. A JKS Body lift and Motor mount lift cured the problem without dropping the TC skid.

And that, my friends, is when it all started almost 5 years ago. I have not stopped buying stuff for my Jeep, and my wallet has been empty ever since.

Is there light at the end of the tunnel? I'm not seeing it.
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Old 02-07-2012, 04:21 PM   #16
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i have the SJ 2.5" and it did have the TC bracket and no vibrations. although i heard that if you take the hardtop off and the it gets lighter you can experience a vibration. its winter here in the north so i have yet to take the top off to test that theory...
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Old 02-07-2012, 06:13 PM   #17
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I spoke to a 4wd shop aboout the whole "will I get vibration issues with a lift" thing and their response was as follows:

2" - Probably not.

2.5" - Possibly.

3" - Probably.

Now, not all "kits" or lifts are created equal. In my case, my 2" BDS netted me 2.5" on all four corners, and I am getting a vibration around 30 mph. It feels like driving over muffled, rough pavement. I have not had it over 40 mph yet and it is still at the shop waiting to get the track bar relo bracket installed.

My mechanic buddy is going to just drop the T-case as I won't be lifting any further to require anything else. The lift will likely settle a bit on it's own and may settle enough to make the vibration go away, but dropping the T-Case is simple enough for now.
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Old 03-16-2012, 04:21 PM   #18
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people who are saying that the 2.5'' rc 2.2 shocks are long need to do a little more research. If you take the time and find out with you need and what you supposed to have then you wont have those problems. Yes rc messed up and was sending shocks that went to the 3.5'' lift, not the 2.5'' lift. couple inches is a big difference. I did my research and read reviews and comfirmed them with rc. the correct rear shock length needs to be 13.5'' compressed. Dont say that its crap if you dont even have the right gear under ur jeep..

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