I don’t know what to call this but I’m wondering if it’s normal, a problem, or a serious problem..
The Thing:
when I’ve got my foot on the brake, release parking brake, start it, give it a few minutes, and shift to reverse it does a hissing clunk and the height level of the Jeep rises, then neutral, hiss clunk rise some more, then in drive hiss clunk and rises again and then stays at that level until it does the whole thing in reverse when I park it and drops back down. It doesn’t rev the engine or accelerate on its own or anything like that, it’s just Jeep itself physically goes up and down.
My TJs been doing this thing for the 19 years I’ve had it... It’s an ‘02 4.0 automatic 3” pro comp lift on 33s. Don’t know if any of that matters. it’s the only Jeep I’ve driven so I assumed it was normal and only recently started noticing that people actually look at me crazy when it happens so maybe it’s not normal. And when I went to make my appointment at a local 4x4 place to get my frame sections replaced and was leaving the guy watched it do the thing and was shaking his head while I pulled out like what was that.. something else serious to fix.. but I didn’t turn around and ask what he thought because I was already driving and I’ll be back there in a month or two.
Anybody know what it’s doing and if it’s an actual problem? Is it just the springs and the axle doing their thing? Never would have started to question it if I hadn’t started to notice people around me always making the
face every single time I start or park 
I saw someone else ask about what I interpreted to be the same mystery issue in another wrangler forum and never got a reply so figured I’d try here since maybe more peoples TJ’s do the thing.. Thoughts?
The Thing:
when I’ve got my foot on the brake, release parking brake, start it, give it a few minutes, and shift to reverse it does a hissing clunk and the height level of the Jeep rises, then neutral, hiss clunk rise some more, then in drive hiss clunk and rises again and then stays at that level until it does the whole thing in reverse when I park it and drops back down. It doesn’t rev the engine or accelerate on its own or anything like that, it’s just Jeep itself physically goes up and down.
My TJs been doing this thing for the 19 years I’ve had it... It’s an ‘02 4.0 automatic 3” pro comp lift on 33s. Don’t know if any of that matters. it’s the only Jeep I’ve driven so I assumed it was normal and only recently started noticing that people actually look at me crazy when it happens so maybe it’s not normal. And when I went to make my appointment at a local 4x4 place to get my frame sections replaced and was leaving the guy watched it do the thing and was shaking his head while I pulled out like what was that.. something else serious to fix.. but I didn’t turn around and ask what he thought because I was already driving and I’ll be back there in a month or two.
Anybody know what it’s doing and if it’s an actual problem? Is it just the springs and the axle doing their thing? Never would have started to question it if I hadn’t started to notice people around me always making the
face every single time I start or park I saw someone else ask about what I interpreted to be the same mystery issue in another wrangler forum and never got a reply so figured I’d try here since maybe more peoples TJ’s do the thing.. Thoughts?
