MileHiXJ

Today I started hearing a thumping noise under the passenger side floor board when I accelerated from a stop and dumped the clutch a little quick. If I keep the revs high and slowly let out the clutch pedal, no problem. But if I dump the clutch quickly, I get a long series of loud knocks from under the floor that only go away if I push the clutch back in. Any ideas?

Gee oh Dee

Bad trans or motor mount? Worn suspension part?

Have you looked under at all?

MileHiXJ

Not yet. Just spent the evenings last week and all yesterday changing the upper and lower ball joints on both sides, a tie rod and both of its ends, and replacing an oil covered starter.

If it was up to me, I'd be under the Jeep right now, but the wife is a little tired of it monopolizing all my time, and from the mess it makes.

So while I was watching tv with her tonight, I thought I'd through the idea out there.

Motor mounts is what I am fearing. The look like a b*tch to change. And the ball joints took a lot out of me last week.

Turbo X_J

+1
Engine and/or transmission mount(s)
Either that or aggravated gnomes

bigshow1983

sounds like a ujoint in the one of the drive shafts or possible the u joint in the axle shaft it self going out

victorlanda

x2 mounts or u-joints

Slick761

Have someone ride in back. If its u joint theyll let you know.

Saltydog

mine did the same noise sometimes and is week mounts allowing the exhaust to thump the crossmember or floor board.

Blue88

mine does it too. It's the exhaust pipe hitting the cross member. I put a piece of floor tile (bc there was one on my garage floor and it can handle the heat) between the pipe and cross member. Problem solved and it did not create a new one.
This noise drove me crazy. I thought it was the u-joints then the T-case.

Buckshotmckee

Passenger motor mount is bad. I had the same problem with my 89.

Brett

its the leprachaun in the trans telling you to be nicer to the clutch

Gee oh Dee

Yours has one of those too?!?

Brett

I have an auto... he is in the tourque converter lol

bsmith97xj

thats funny

scheetz_21

i got the same noise but on the driver side... lol and only when im driving in the yard!? lol maybe the leprechaun doesn't like the grass? its tickling him... haha