Gents,
Sent this to Zone, maybe some of you have an explanation.

I've got probably 10K trouble free miles on my 3.5" lift up until this past week when I was driving cross country...

At highway speed (60-70mph) when going over any kind of dip in the road, as the suspension bottoms out, I'm getting a notable vibration from front drivers area under my feet. Don't feel it in the steering. It's got the frequency of a tire rub (very loud, high speed vibration), but has a metallic sound to it. Like the splines of the drive shaft rotating on something metal. I've gotten under the jeep several times and I see no signs on either the tires, fenders, fender wells, bumper, rock rails, etc. of any rub anywhere. Checked the drive shafts, no rubbing there, nor do I see how it could. I'm completely baffled. I really doubt the suspension is bottoming out on the bump stops. I've got an ARB front bumper which clears the 35" Goodyear MTR's with mucho room to spare. Their on stock Moab wheels with 1.5" spacers. Never had any rub problems off road with the sway bar disconnected. Got your extended front sway bar links as well, not the stock rear ones.

Any ideas? I'm completely out of ideas. Only happens at high speed.

 

is there rubbing on the track bar some people have that problem

 

I'll look, but off the top of my head I don't see how. There's nothing rotating close to it if memory serves me correct.

 

It's GOTTA be your flux capacitor.

 

Check your driveshaft boot(s), sounds like the DS is getting ready to exploded.


3.5" lift, do you have adjustable control arms?

 

x2 on the driveshaft. Do you have the OEM driveshaft or aftermarket? If it is still the stock one (larger diameter than aftermarket) there is a good chance that it is rubbing on the side of your tranny pan when your front suspension is compressed. It could either be the DS itself, or the boot. It should be easy to see if it is...

 

I'll look again, I didn't see any scuffs or marks on the drive shaft, and didn't see how the DS could compress up that far. Seems like it would've done it if it was stock too, seeing as how it's a level compression, and not hitting the bump stops.

 

Got a response from them via email, he's forwarding it on to R&D.

 

look at the boot at the transfercase...

 

I had the very same problem, then it showed itself on the freeway at 65 mph. The stock joint at the transfer case got red hot and caught the rubber seal on fire. I am sure glad I carry a fire extinguisher mounted to my driver seat base. New Tatton's front and rear shafts ($400.00 each total cost including shipping) are being installed (by me) today and tomorrow. I had them in the mail prior to this problem, because of the threads posted on this site about the need to replace the stock shafts if there is any lift added to your ride. Curtis Tatton makes an excellent product (801) 979- 4908.