Originally Posted by fourliter dan
ide throw it on the back if pos.... unless you have a limited slip. truck will handle better with the spare in the back.
You should never have mismatched tires while putting power to the ground, transmissions on FWD cars get ruined all the time because people put there smaller spare donut on the front and drive around with it for awhile thinking it's fine.
Also if you have LS rear end I will add a double negative, because it will mess up the diff.
Either way though, it's not good to be running different tire sizes no matter what side of the truck there on.