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Discussion Starter #1
I had a local (and reputable) shop put a Zone 3" lift on my '09 Wrangler X 2 door. I've noticed that, on highway driving on changing surfaces as I approach or surpass 60 mph, the vehicle begins to shake quite a bit...seeming to be most noticed at the rear of the vehicle and then spreading forward. If I let up on the gas, or apply the brakes, the problem disappears...but this isn't always advisable while highway driving. Any suggestions? I am planning on a front end alignment AFTER I put on new, larger wheels and tires, but I'm uncertain as to whether this is the root of the problem.
 

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Ball joints, track bars, unbalanced tires. Any number of things. Did the shop that did the install also sale you the lift? What components where replaced with the lift?
 

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Discussion Starter #4
@jwann01...the shop advised on what lift to purchase. The install included new coils, shocks and stabilizers. Thanks for your reply. I suppose I'll head back to the shop and address my concern with them.
 

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What was included with the lift ie Control arms/track bars ?

Speed dependent vibes are usually tire balance.

The stock shafts don't usually vibrate unless there's a failure. Take a quick look underneath around the CV joints for grease splatter.

It could be a lose bolt or even the shops failure to torque the bolts on the weight of the axles.
 

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This might be a no brainer, but check your lug nuts. A shake or shimmy could develop with speed and letting off the gas could cause it to disappear or get worse. Just a thought.
 
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