Available Spare Tire?

For short distances and moderate speeds, it'll be fine. Too fast or too far, and it will could overheat the rear diff clutches & fluid.

You DO NOT want that on a locking type differential.....I had a flat on the rear of my jeep, and had to swap 2 tires so the spare was on the front due to the locking rear diff....posi or limited slip is fine for say 50 miles or less......