I just put 325/60/18 cooper stt on my truck and when i get up around 60 i have a hard time keeping the truck straight. it feels like the steering is loose. the tires are balanced and everything like that. so i was wondering if someone could help me. Thanks

 

Are you lifted, leveled, etc?? When was the last time you got an alignment?

 

i put on the 2.5 leveler. then i got an alignment, i put on the coopers on and then i noticed the problem. i know i could get a steering stablizer but i thought i would only need one if were to get like a 4 inch lift or bigger

 

The wider a tire is, the more it will pull and follow road irregularities. I'd also check the air pressure and make sure it is not too high as this can make the truck "wander".

 

Do u have stock or aftermarket wheels?

 

probaly too much air in tires.