4n6pc

hey guys, new question, when I go over a speed bump (or anything like one) it sounds like if you had a trunkload of stuff. I cant figure out what it is and I dont have anyone that can ride in the back while I drive over one suggestions??
it doesnt do it over regular bad roads and potholes...
thanks

That Jeep Guy XJMJ

upper shock mounting bolts broke..... tailpipe hanging lose and colliding with everything.... your exhaust period, rear sway bar broken.... really rusty rear floors....

basically crawl under the rear of the jeep and look for anything that looks suspicious for rumbling around

4n6pc

Thanks, I have tried to pick something out, but my exhaust and shocks are solid (just replaced them) nothing under the back seat either thought maybe jack and stuff loose but nope thats not it either. May have to take it somewhere.... dont want the axle comin off and I cant move it by hand, so still nothin obvious.

freegdr

rear sway bar still there possible rubber mounts

VTJeep

is your bumper mounted well, or like mine, is there a broken bolt that allows it to move up and down just enough to hit the bottom of the lift gate? cause that could be it. beyond that, just crawl under there and start yanking on stuff.

mdcmn7

are your upper shocks hitting? I am referring to the whole bar pin/BPE thing. I had this thump in the back of my jeep for months and I never could figure it out because I couldnt reproduce it in the garage.

One day I threw on a set of BPE's because I changed my shocks and didnt want to have to fight with the upper bolts again, and it was gone, like magic

VTJeep

ha, cool. i was thinking BPE's might be in my near future. i guess this is just one more reason to install them!

93gc40

Knocking in the rear is Exhaust, shackles, shocks, Bushing. Exaust is hung on rubber mounts so it can flex, common area it hits is on the tranny mount and against the gas tank, shake the exhaust to verify it is not hitting, eyes can lie. Shackles can hit the rear of the shackle box, usually only on lifted rigs. Worn bushings in the shackle and springs can knock. Loose shock bolts, bad bushing or too long or short shocks can knock. Just because it is NEW doesn't mean it is good or installed correctly or not knocking. Worn U-joints and bearings can even knock like you describe.

4n6pc

thanks headed out under the jeep today will let you know what I find, I will check each one of your suggegestions. this forum rocks no joke, I would have to take it somewhere hopefully it will be one of the thing you all have mentioned. thanks again.....

That Jeep Guy XJMJ

you gotta shake that $hit like your trying to make the clunking sound.... you cant just "shake it like a Polaroid picture" or flick it with your finger(s)... oh yea thats sturdy..... you gotta get angry lmao let us know what ya find buddy

mdcmn7

I have my kids hop up on the bumper and have them do a contest to see who can shake it the most. They can almost simulate a rock garden at 30mph

Programbo

I'll go along with this one. I had the exact same kind of problem and couldnt find the cause no matter how much I looked. Turned out the rubber bushing in my one rear sway bar end had opped out and the metal was free to jangle around on bumps especially. Since it's up behind the tire it hard to see when just looking.

Kuro89

this has happened to me twice now, and every time it was the the bolts for the bar pin though they never broke they either fell out or loosened I hate those things and I'm getting rid of them soon

rideordie66

My e break lines smacked the floor and sway bar when I hit bumps. Check them too. I took my sway bar off so no more wacky on that but the knocking on the floor was solved by putting some springs from the line to a hole on the "frame." shake that jeep like it owes you money and your trying to get the money to fall out.

90cherokeeguy

this may sound stupid check that your spare tire is attached tighly mine does that every once in a while