I have a 99 sr5 and was wondering if when in 2-wheel hi, is there a main drive tire, or are both rear wheels used the same? I'm asking because my right rear tire is bald, and theleft rear has probably another 5k left on it. Thanks in advance if anyone knows

 

Both rear tires should get equal torque with the stock differential. Might be the air pressure in the one tire was a little lower. Were the tires rotated regularly?

 

im not sure i just bought the truck but im assuming no because the front set is only halfway spent