I currently installed a 3" zone lift zone hydro shocks with a 3/4" spacer and a metal cloak adjustable track bar up front of my 98 tj. Before the mods it rode smooth with no driving issues. The tires are 31x10.5/15 and are the same as before the mods. I had it lined up everything is in the green with the exception of caster. Left side is at 6° and the right at 5.9°. Does anyone have any suggestions? The control arms are stock. I first noticed a death wobble when I applied the brakes kinda quick. Afterwards I can feel it when I let off the gas as I'm slowing down without applying brakes. I'm kinda lost as where I didn't have this problem before the lift. I've torqued the track bar down to spec as per metal cloak. I've even rotated the tires and it still does it.
In need of some help!!
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are your new track bar and drag link parallel?
also, are you sure that its not a driveline vibration? check the u-joint angles on the rear drive shaft.
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The symptoms are pointing towards the drive shaft angle. As you accelerate and decelerate your pinion pivots up and down slightly. Sounds like while driving the drive shaft angles are coming into alignment because of the pinion rotating up and OUT of alignment when you break or slow down because of the pinion rotating back down.
If it were a bad u-joint you'd hear it clunk or rattle.
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to test the rear ds idea cheaply and easily, get some longer bolts and a bunch of washers and space the transfercase skid down to see if that helps.
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That sounds like a balance issue, generally associated with tire. Maybe you lost a weight?
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I'm with the tire balance answer. That's the speed where tire balance is usually noticed. If a tire has a balance problem guys used to run them on the back because it's least noticeable there. I had one on the front of my work van that shook the wheel. Put it on the back and smooth sailing. Nothing else you did should have really started a problem.
I would take them to a shop for rebalancing and go from there, might save a lot of trouble. Also, if you can, try to get a look at them as they spin on the balancer. They have internal stresses and can end up out of round over time, you can see it by watching the top or bottom of the tread as they spin. The tire guys usually ignore this and balance it as is, but if it's excessive it will bounce even if balanced.
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