When I got my 89 Sierra k1500 from my FIL it had P rated tires on it with about half tread life left. I hated the way it handled so much I took it to my mech and said I think the shocks are going bad. Turning corners felt like all the weight was transferring and leaning and going down a warn tar road it was hard to keep it going straight kept following the grooves. He took one look at the tires and said you have P rated tries on here when they should be LT tires. Put new LT AT3's on and couldn't believe how much better it handled, of course as other have mentioned a tad rougher but worth it for the handling.