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Discussion Starter #1
Got a Jeep wrangler with a 8 inch lift and 39 inch tires. Now the problem is once I hit 35 mph the jeep start shaking like a nut. I checked everything balanced the tires did a alignment, all ball joints are good has CV rear drive shaft, Track bar is good. Could it possibly be that the differential is to weak or that has no effect on it?
 

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It's called death wobble up grade the front steering parts to bigger stuff them tires are huge for a jeep
 

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Got a Jeep wrangler with a 8 inch lift and 39 inch tires. Now the problem is once I hit 35 mph the jeep start shaking like a nut. I checked everything balanced the tires did a alignment, all ball joints are good has CV rear drive shaft, Track bar is good. Could it possibly be that the differential is to weak or that has no effect on it?
Is the jeep violently shaking? Or bad vibes?

Violent shaking- you have death wobble. Replace your track bar and tie rod ends.

Bad vibes- do you have a slip yoke eliminator?
 

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Discussion Starter #4
I'm talking about shakinggg non stop till you come to a stop. My tie rods just got replaced but not the track bar, Is there a specific trackbar you would recommend? I have a currie heavy duty tie rod system. Would there be any thing else I should look for?
 

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I'm talking about shakinggg non stop till you come to a stop. My tie rods just got replaced but not the track bar, Is there a specific trackbar you would recommend? I have a currie heavy duty tie rod system. Would there be any thing else I should look for?
Then you have death wobble, you must have missed the sticky topic we have at the top of the forum. With those big of tires, you need to make sure they are balanced nearly perfectly.

For track bar suggestions, I don't have any. I run a stock set up with a stock track bar so I don't know I any aftermarket companies.
 

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For track bar, jks, rubicon express, and i think currie has one. But jks is hoghly recommended by alot of people. I run the rubicon express on mine and have no clearance issues, although i dont have 8 inches of lift lol those are some good ones. Jks being most common
 

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Got a Jeep wrangler with a 8 inch lift and 39 inch tires. Now the problem is once I hit 35 mph the jeep start shaking like a nut. I checked everything balanced the tires did a alignment, all ball joints are good has CV rear drive shaft, Track bar is good. Could it possibly be that the differential is to weak or that has no effect on it?

I'd like to see an 8 inch lifted wrangler with 39's...:popcorn:
 

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What axles are you running that are strong enough for 39" tires?

For the Death Wobble you're experiencing... first, the larger the tire size, the more perfect the tire balance becomes. And for a 39" tire, if it's not perfect, you can bet an imperfectly (not just good enough) balanced tire tire will trigger DW. In the case of big tires like that, "good enough" tire balance won't be good enough.

Next, try this... with the tires on the ground, have a helper turn the steering wheel back & forth while you watch the front steering & suspension & look for something moving side-to-side that isn't supposed to... like the track bar which shouldn't have any side-to-side movement at all. The drag link and tie rod should/must have rotational play, is in they will rotate back & forth when you twist them by hand, but they should not have any side-to side movement where they are bolted in place.
 

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Discussion Starter #11
Thanks guys for the responses and advice. I put on a different set of tires and rims and the death wobble is gone. So I think the culprit is the tires, thinking about getting 37s or 38s.
 
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