hi everyone, i installed a 2.250 bb and put new skyjacker hydros on my 06 lj. and when i go over certain bumbs that are aggresive like rr tracks, i get a weird pop and it sounds like it is hitting the underside of tub. i have checked every thing and it is all tight. i do not have a track bar drop on eiter. it all started when i picked up the back with a fork lift to take the rear passanger tire off. i dont know what happened. has any one else had this happen to them or know what the problem is, thanks alot for any help.  

You need to have a track bar bracket in the rear. It will help with the alignment and centering of the rear axle. Here is one from JKS for $65. Scroll down to the bottom of the page. Click here for JKS MFG.

After you installed the lift, did you loosen all your control arms, both ends, front and rear, upper and lower, including the track bars. And then re-torque them with the Jeep sitting on the suspension on the ground. This allows the rubber isolators in the control arms to be in a neutral position. This might be the cause of your popping if you did not do this.