So what happens if I keep my stock Rubicon spare on the tailgate and end up using it with 3-35s if I get a flat?

Major issue for a trip back to the garage? <100 miles?

 

If your ESC is active you aren't gonna get far

 

Good question, was wondering the same thing..

Turn ESC off?

 

Isn't it bad on the drivetrain/gears? since the diameter is off on the spare in this case, thus making the spare rotate slower then the other. not sure, though just what I heard

 

Probably mess with any BLSD as well. The wheel would be spinnimg faster than the 35s so to the computer it thinks it has lost traction. Your handling is gonna be way off as well. I wouldn't drive highway speeds and I wouldnt want to do 100 miles on it. Actually, I wouldnt do it. Just get a full spare.

 

If you disengage your ESP, you may be able to drive a few hundred years off a trail. I sure wouldn't enter any roadway, though. You'd likely be better off with one of those tire-patch kits than the significantly undersized spare.