wormhole

For the past couple of wheeling trips I've done I've been hearing a sound of something rubbing when the suspension is flexing but I never could see any evidence of where it was rubbing at.

We'll today I've found the problem thanks to some mud:

Driver's side rear

So at full stuff the driver's side rear tire rubs the inside of the fender. The passenger side doesn't rub when stuffed.

What would cause just the drivers side rear to rub?

scuba

Do you have a panhard drop or extension?
Could be that since you're lifted the axle moves towards the passenger side thus changing where the tire ends up once it is fully compressed.
Also, check for bent lower links. Passenger side could be bent thus pushing the driver side back. Or hell, bad bushings could do the same thing.

My 2 cents..

wormhole

I have the panhard from Sonoran Steel. Lower links are for Sonoran Steel as well and I doubt those are bent.

Bushings? I have to check on that one.