Random rumbling noise and vibration

I seem to have a new noise on the TJ.

I’m new to learning all the pieces, but I’d like to learn more and be more knowledgeable to even know what to ask for — so far, no one who has looked at the Jeep has found that it had an issue. I know something’s off, so here I am for advice.

It doesn’t happen all the time, or every time the Jeep is stopped. But often enough that it’s concerning.

It’s a 2004 manual, I6

Last spring it got a 4” lift, 33s, new CV driveshaft, SYE, new transmission mount, and a few other various things.

I’ve recently had it regeared — 4.56.

The first time I noticed the vibration was because the dashboard was rattling. But after listening closer, I noticed there’s a rumbling vibration.

I’m going to attach a video, which I admit does seem to magnify the rumbling sound (and the dashboard rattle).

When this video was made, I had just driven the Jeep about 4 miles, so it wasn’t cold. It’s sitting still.

It seems to go away when the Jeep starts to move, as seen in video.

Any thoughts what it could be?

Thanks, all!

I checked with the shop that replaced the transmission mount, looks like it was an Anchor 2882 (https://www.summitracing.com/parts/ani-2882).

Based on this post, it looks like I have the NV3550 that's notoriously noisy — but does it have such a vibration? It hasn't always sounded/felt like this, it just seemed to start after the work done last year.

cpwolf said:

My first thought was “did you eat at Taco Bell?”

But the next question, did they put some other kind of Mount, Poly Bushings etc?

Click to expand...

Nothing else was added, but the transmission mount looks to be a $16 one (not close to what they charged me for it) — so, I'm wondering if the quality of it is lacking.

Thanks, all, for the input! I think I’ll start by looking into getting the transmission mount swapped out. Hopefully that’s all it is.