Emusoda

Recently I had my jeep lifted and put new tires on it and now I'm rubbing in the rear. I only hear it when driving at speed and it occurs around 30-40mph while driving in a straight line. I can hear a vibrating hum ever now and then when the tire rubs. Here are the specs on the jeep:

3" Zone offroad lift with full leaf packs
15x8 wheels with 3.75 backspacing
33.12.50 tires
New rear shackles, one oem the other dorman

It is not the fenders as I have cut and folded them. There is a lot of room between the tire and the top of the fender as I am able to stick my head in and look around. The tires are no where near the leafs or the inner fender wall because of my backspacing. I'm very confused on what could be causing this because I have clearance all around the tire. Any input will be greatly appreciated.

freegdr

Sure its not just tread hum your hearing ?

Emusoda

Could be but wouldn't the noise be constant and not on and off? Tires are bfgoodrich mudterrain km2's

freegdr

Set axle on jack stands and run it ....could be drive line hum.

Gee oh Dee

Are there any rub/wear spots on the back tires?

If its really rubbing you should see exactly where its rubbing...

freegdr

I hope the obvious was checked.

RainShadow

I had a tire rub after I went up TWO sizes. It was the rear tires at the very back wheel opening hitting the fender molding. Only when about
50+ on the freeway, with camping gear and where the road would dip.

Just check your tires for marks and then all around your wheel opening.

good luck , Randy

Emusoda

There are some little slice marks but I don't see anything that comes near them. The only part that would cause this would be the upper fender area but I would have to be flexing it before it would come even close. Here's some pictures

crimsondragon

I doubt you're rubbing. You'd see more evidence of it.

Emusoda

I found out that I hear the noise if I floor it and then let off the gas. I can also hear it while going down hill. I'm starting to think it's a bearing somewhere back there

freegdr

Drive shaft angles ?

Emusoda

Might be that as well. I get some wicked vibrations when taking off from a stop. I might be in need of a transfer case drop

Bobvila

I just installed the same lift, also getting some weird vibrations but only at low speeds. Mine almost sounds like it's something in the drums. When I start slowing down for a stop sign, it's almost like something is catching in the assembly and it's a slow tunk tunk tunk sound. Is yours similar?

XJ Mayhem

May need to shim the rear.

Gee oh Dee

Check your motor and transmission mounts.

And if they are bad, be ready to deal with drive shaft vibes once you fix the mounts.