I have a 92 c1500. I have one new lt235/75/15, real good tire. I need 3 more, but I found some Goodyear P rateds for $55.00 each as opposed to 110.00 each for LT's. If I mix tires on the rear end will I hurt the gears?

 

if the tires are different size Circumference it could hurt the gears.

Big problem for you is driving the LT will be a lot stiffer tire and truck may not drive right.

For $55 ea i would buy all the same tires and not worry with it.

$55 is a small price to pay if miss matched tires were to cause you to have w accident.

 

When you state C1500 is that "C" as in 2-wheel-drive? If so, you don't have to worry about different tire sizes affecting your transfer case. Generally, mixing tires is a bad idea, however, because different tires react differently to different heat ranges, inflations, driving ,and road conditions.

 

Don't do that. LT tires are heavier tires (more plies) then P rated, so they roll harder on the highway, which will make your truck pull to one side.

And just so you know this, P rated tires are 4 ply tires, very thin. They puncture easily and can't carry much weight, the only good thing about them is they ride smoother and usually a little less noise too. Makes them good for cars and SUV's but not for pickups.

At the VERY least, keep the front 2 the same and the back 2 the same. And the same size all around for sure.

EDIT: btw, what is the load range on the LT tires? if they are C then they are 6 ply, if they are D then 8 ply, if E then 10. Like I said, more plies = more weight and more rolling resistance. Don't mix them up.