Question?

Will it hurt my truck if I run 275/55r on front and 275/65r on back??

 

4x4? Please don’t

 

If your a 4wheel drive rig tires need to be same diameter.

 

Why?!

 

If you are a 4x4, YES it will hurt your truck.

 

It is always best to have 4 matching tires unless you have a vehicle designed to run different tires front and back. Handling, braking, traction etc., will be better. This is particularly true with features such as ABS and traction control. Different tires confuse the computer. You can get by for a short period of time on a spare that might be a little different. But that is for temporary use and only if the sizes are pretty close.

If the truck is 4x4 it is extremely important that they be the same size if you operate in 4X4.

 

Are you sure you're not a 3rd Gener?

 

That made me laugh...

 

Only if you use 4wd.

Don't have it or don't use it, it will just look goofy unless it's lowered