Petza914

Are your wheels, rotors, and lug bolts stock or aftermarket?

nkerkimis

All stock.

Petza914

I don't know. Maybe rear differential. Normally I'd say it's tires or wheels or tge wrong type of lug bolt (wrong seat type), or spacers that don't have the wheel centric flange.

Ericson38

Bent driveshaft will cause this, also possibly not installed properly in the way the u joints are bolted up to it. If Differential rebuild was bad, would make noise, but not vibrate the whole truck. I saw drive shaft or u joints. The drive shaft may have a balance weight and index that was not recorded and reset in the same way as when they took it out (either +-90 or 180 deg out of original position).

95_993

How many miles? A low possibility, but a bad strut/damper would let the wheel begin to oscillate when hits a resonant frequency.

nkerkimis

85k miles.

nkerkimis

At higher speeds like this? Would it be front or rear driveshaft?

Ericson38

The rear one is longer, but where were they working ? I thought rear diff, which means the drive shaft was removed, and maybe fell over when someone leaned it up out of the way (dented it), or its balance weight got kockd off, or it is clocked wrong into the companion flange on the rear diff. Front shaft can cause same issues, but is not the vibration in the rear, and was it not the rear diff ?

nkerkimis

The work was done on the front differential.

Ericson38

Still needs to be fixed. Out of balance or non-straight shaft will take out oil seals and bearings in transfer case and front diff.

nkerkimis

So you think that the front driveshaft needs replaced?

Ericson38

Inspected for defects. This needs to go to Porsche. Checked for balance and straightness. Also correct installation. Someone is learning on your car, in my opinion. Did they test ride it with you to confirm the issue ?

nodoors

Have you checked the control arm bushings yet?

dpatel710

^^^This was the source of my vibrations. Road force balancing took care of a good bit but shot UCA were producing vibration at highway speed. Grab the UCA and move it around, the bushings had separated on mine and I was able to move it back and forth easily.