HELP! My Jeep won't kick its bad habit!

RockChucker

Well-Known Member
Location
Highland
Alright, in brief, here is my Jeep's problem. Death Wobble. It is a TJ with stock control arms and 3 inches of lift. It was really bad when I first bought the Jeep back in may, but changing out the axle to one that was straight helped out loads. Next, I put on a new steering stabilizer. That also helped tons. Then I had an alignment done and it was all but cured or so I thought.

Now after our recent Moab trip, I have been plagued by it worse than ever. I went on the trip with 33's but on returning, I mounted the 35's that I bought a while back. This intensified the problem by 10x. I know that it can not be the tires being out of balance because it is a fresh mount and balance that is 3 days old.

Since the problem was so severe with the 35's, I put on currie hd tie rods. This helped, but I still get a shimmy at around 40 -45 mph. This shimmy will turn into death wobble very quickly if I hit any sort of a bump or irregularity in the road. This is what I have done.

Now this is what I'm wondering could be the cause. First off, I don't have a drop pitman arm. Could the drag link be more susceptible to shimmy if it is at a steeper angle? Could bad bushings in the control arms be a factor? I know that one cause is a bad track bar, but my track bar is off an '04 and the rod end was really tight, but then again, could that also be a cause? Could it be my caster? If it is too close to 0* would that cause the wobble? Would it cause wobble if it is too negative? and finally, How could I tell if it has anything to do with my steering box? I hope it doesn't but that is the last thing I could think of as a problem. and one other thing that has always bugged me...why does death wobble only happen at certain speeds? Anything below 40 or above 50 is solid and doesn't feel like it is going to shimmy.

Thanks for the help. This is really frustrating. I would prefer to get it fixed and be able to drive my Jeep with out fear of death wobble.
 

I Lean

Mbryson's hairdresser
Vendor
Location
Utah
Everything you mentioned is a potential cause, with the possible exception of the drop pitman arm--you shouldn't need one with 3 inches of lift, nor would I recommend one unless you're changing your trackbar location.

If you can't get the caster you need with the cam bolts, you'll need to invest in some aftermarket control arms, preferably adjustable ones.
 

RockChucker

Well-Known Member
Location
Highland
i actually plan on coming into tera tomorrow to get an adjustable track bar and drop pitman arm. i'll talk to you when i come in if you are there. could the maximum caster of the cam bolts still not be enough? i wonder because my uncle has a similar set up to mine with stock contol arms and he doesn't get death wobble. his exception is a drop pitman arm.
 

BlackSheep

baaaaaaaaaad to the bone
Supporting Member
Pay close attention to the condition of your bushings. Whose lift are you using? I started out with a procomp. The bushings wore out quite quickly (after many trips to Moab!:D). When the bushings wore out, I had a bad death wobble. Also, make sure all of your control arm brackets are still in good shape. A broken bracket will be just like a worn bushing (or similar at least).

Adjustable control arms with quality bushings are the way to go. I'm up to about 5" of lift with no drop pitman arm and RE longarms (adjustable for camber). No troubles except out of balance tires.

Good luck, it can be solved, just be methodical in your troubleshooting and check everything!
 

RockChucker

Well-Known Member
Location
Highland
Pay close attention to the condition of your bushings. Whose lift are you using? I started out with a procomp. The bushings wore out quite quickly (after many trips to Moab!:D). When the bushings wore out, I had a bad death wobble. Also, make sure all of your control arm brackets are still in good shape. A broken bracket will be just like a worn bushing (or similar at least).

Adjustable control arms with quality bushings are the way to go. I'm up to about 5" of lift with no drop pitman arm and RE longarms (adjustable for camber). No troubles except out of balance tires.

Good luck, it can be solved, just be methodical in your troubleshooting and check everything!
i think part of it definitely is my bushings. they are just the stock control arms with the black rubber? bushings. the jeep has 95k on the clock so i'm thinking that could be part of the problem. i'm also wondering if my tires could be out of whack. i just drove to my gramma's house and i had a shimmy all the way up the freeway, but then again, it could also be the caster....i don't know i'll just have to do what you said. be methodical. it is just so frustrating. now i'm also beginning to wonder if bad ball joints could be to blame as well. i'm not sure if mine are bad, but it is just another variable to toss in there.

how are you running 5" with no drop pitman arm? i thought they were necessary for any amount of lift?
 

waynehartwig

www.jeeperman.com
Location
Mead, WA
Put your 33's back on and see if the problem goes away.

Freshly balanced 35's means nothing. Some shops can screw that up easily an dmake it worse.

If you don't have an adjustable trackbar, get one. 3" of lift you should have one. If you can't afford one, at least relocate the hole on the axle end (drill a new hole).

As for adjustable control arms, you don't need them with only 3" of lift. Your caster can't be off enough to worry about and neither is your pinion angle.

Caster being off will not cause death wobble. Toe in being off will.

You changed your steering linkage, but didn't have the alignment redone.

Yes, worn out anything on the front end can cause death wobble.

Where would I start? Putting the 33's back on and seeing if it's fixed.
 

RockChucker

Well-Known Member
Location
Highland
alrighty, after much time thinking about it and spending a while at teraflex with carl, i got the problem fixed. my track bar was shot, so i got the adjustable one. that didn't cure the entire problem though. next i looked at my cam bolts just to make sure they were equally set. they weren't. i adjusted them to make them equal and voila, shimmy gone and i haven't had death wobble. only time will tell though, as i haven't done extensive testing...thanks for the replies.

wayne, in my experience caster does affect death wobble. i had it really bad when i first put the axle in, i checked the cam bolts and they were way off, i fixed them, did an alignment and it was cured.
 
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