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.
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
98 Sport 4.0 Automatic, with a Dana 44 up front and 4.56’s and a Ford 8.8 in the rear W/ Detroit Locker and 4.56's. 35X12.50X15 Goodyear MTR’s mounted on Mickey Thompson Side biters. Rubicon Express 5.5 inch Long Arm lift. Rock Crawler type bumpers front and rear. 9500lb winch, Poison Spider rocker guards. .
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.
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.
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.
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.
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.
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.
It was the Law of the Sea, they said. Civilization ends at the waterline. Beyond that, we all enter the food chain, and not always right at the top. -Hunter S. Thompson