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Old 04-14-2007, 05:39 PM   #1
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t-case drop problem...

Ok, so I got minor vibes and I'm trying to drop the skid to get rid of them. I loosened the bolts and low and behold I got me a problem deluxe.

It looks like there is some sort of theaded thing set into the frame rails that the bolts screw into. Looks like a washer at first, but I can see that it goes all the way through and is where the threads are. On one bolt the little thing is spinning with the bolt. The bolt will neither come out or go in now.

What the heck am I supposed to do now?

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Old 04-14-2007, 06:03 PM   #2
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That is called a nutcert, the bolt is threaded into it. This is a common problem. Try tightening all the bolts back up and then try loosening that one bolt out. I had 2 of them do that to me. If you get it out, run a tap to clean your threads and then run a die over the bolt. I ended up having to drill a hole in the frame big enough for a number 2 Phillips screwdriver to hold the nut in the frame from turning. GOOD LUCK

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Old 04-14-2007, 09:12 PM   #3
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i was readin instructions for a tcase drop and it said somethin about a stud that you have to cut out
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Old 04-14-2007, 09:41 PM   #4
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Huh? I didn't read that on any of the instructions that I saw.

Anyways, I finally got it all squared away. I had to use vise grips that I ground down to make them thin enough to fit and hold the nutcert in place. Two of them ended up breaking loose which almost caused a melt down in the garage...... but I still have some vibes.

I'm at a loss.
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Old 04-14-2007, 10:00 PM   #5
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i think it said you could use vise grips to pull the stud out...anyway maybe its the same...

if you still have vibes then its 99.9 % chance that its not driveline vibes unless you got more than 2" of lift.
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Old 04-14-2007, 10:09 PM   #6
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I had the same problem. use a welder to tack the incert to the frame (right on the part that looks like a washer). It will stop spinning and the bolt will come right out.
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Old 04-14-2007, 10:30 PM   #7
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I don't know how much lift I got because I added two inch spacers and stock rubicon coils. Could have been more than two. So who knows.


(I don't have a welder )
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Old 04-14-2007, 10:39 PM   #8
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Ok tiny here's the deal. What speeds do the vibes happen? Do they happen while accelerating, coasting or decelerating?
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Old 04-14-2007, 10:46 PM   #9
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accelerating. 50 miles an hour to around 60. vibes are in the tub and gas peddle. they're very minor and not constant but a whump whump pattern that doesn't change speed.

I added three washers to the skid. The drive shaft's not loose, all the bolts are torqued down and the tires are alligned with an 8th inch toe-in (tried a couple different measurements).
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Old 04-14-2007, 10:59 PM   #10
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So they only happen while accelerating? Not while coasting or decelerating at those same speeds?
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Old 04-14-2007, 11:03 PM   #11
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I'm gonna lean towards tire balance or wheels out of round
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Old 04-14-2007, 11:06 PM   #12
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Quote:
Originally Posted by MR.CLIFFORD View Post
I'm gonna lean towards tire balance
x2...reason being is because i drove the company car (honda crv) today and noticed that it had the same vibes through the gas pedal...it was definitely noticeable and obviously not driveline vibes.

i probably don't help the tire balance when i leave a big curving tire mark in the parking lot
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Old 04-14-2007, 11:07 PM   #13
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Nope, only when I got my foot on the gas, course that might be because I can feel them then. My feet don't touch the floorboard now with the seat risers, but I don't think there was any vibes any other times but when I was giving him gas.
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Old 04-14-2007, 11:08 PM   #14
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If it only happens at accelerating, I'd say drive shaft - drop it some more or put your stock coils back in.

If it happens coasting or decelerating as well then tire balance - talk to someone where you got your tires that knows what they are doing and have them rebalanced - preferably road force.
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Old 04-14-2007, 11:10 PM   #15
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Do you think the motor mount lift and body lift with help? I was planning on ordering them in a couple weeks.
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Old 04-14-2007, 11:11 PM   #16
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Quote:
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Do you think the motor mount lift and body lift with help? I was planning on ordering them in a couple weeks.
if its driveline vibes then yes...but you'll be taking the tcase drop out...and the MML i think is equivalent to about a half inch of tcase drop.
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Old 04-14-2007, 11:45 PM   #17
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I know it sucks but that may not be enough drop. I added 3 washers to each side and still had a little vibration. I made me 2 drop plates that were about 1/2 thick and installed them then had no vibes when finished.
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Old 04-14-2007, 11:51 PM   #18
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I know, I know, dang it. It was such a pain in the butt to get those stinking bolts out. Dang it, dang it.
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Old 04-15-2007, 12:08 AM   #19
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Heat them up with a torch first. You may have noticed they have blue lok-tite on them. The heat will release it. Just aim it at the head of the bolt, you don't need to get them red hot or anything.
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Old 04-15-2007, 01:00 AM   #20
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isnt an 8th or more toe in too much, i was always told no more then an eight and get it as close to a sixteenth as possible.

id drop the t case a little more, two washers is like and 1/8 or 3/16s Give it at least a 1/2inch drop. with rubi coils and spacers your prolly lookin at close to 3. 25 inches of lift.

do you have an adjustable track bar??
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Old 04-15-2007, 01:04 AM   #21
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No, I sure don't. I was putting on 2 inches, didn't think I'd have to worry about all this stuff. I don't even know what the freaking track bar does yet.
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Old 04-15-2007, 01:20 AM   #22
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Hey check out this website for lots of TJ and other jeep info.

The board is pretty slow but he has lots of great mods and tech/detailed writeups.

I found it very helpful while working on my heep.


Jeep TJ Installation Write-Ups by 4x4xplor.com

here is a link for your steering setup and what is what.
Basic Jeep Front End Alignment

I agree with Redrub on the vibes being driveshaft related since it only happens on acceleration.

I could be wrong on how much lift you approximatley have. Ive read that the Rubi coils are an inch or more taller then the stock tj coils. Ive never seen them side by side for comparison, so i could be wrong.
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Old 04-15-2007, 04:41 AM   #23
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slip yoke eliminator time.

will fix all drive line problems and give you the confidence to wheel the thing.
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Old 04-15-2007, 10:28 AM   #24
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Rubi coils are no taller than any other TJ coils. They are slightly stiffer than some which is why they can give a little lift (about 1/2" usually) but it appears that some non-Rubis have had the same coils OEM from info I have seen. LJ's do as well.

The track bar centers the axle under the heep. When you lift, it pulls the the axle to the drivers side. You may notice that the drivers tire sticks out more than the passengers - thats due to the lift and track bar. At 2-2 1/2" it's generally not an issue, but if you go bigger you will generally want an adj track bar for the front and either an adj track bar for the rear or a rear track bar bracket.

The track bar is also sometimes called a pan hard bar.
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Old 04-15-2007, 11:35 AM   #25
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Brain fart: In the front the axle gets pulled to the drivers side. In the rear it gets pulled to the passenger side
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Old 04-15-2007, 12:53 PM   #26
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Thanks Rawkon thats a good image to save
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Old 04-15-2007, 01:18 PM   #27
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Thanks for clearing that up redrub. maybe the guys swapping them in had old saggy coils.
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Old 04-15-2007, 01:57 PM   #28
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trackbar keeps the axle from moving laterally or side to side.
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Old 04-15-2007, 07:12 PM   #29
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I would get the tires balanced. I just put new tires on my wife's Pilot and after a week it started getting vibes at 50 to 60 mph. I took back to the tire shop and they were are very out of balance. After the re-balance it was good for about 2 weeks. Now the vibes are back. I going to take it back and have them check it again. Just my thoughts.

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