Just got a 98 2WD that came with 235/70/15's on it instead of the 205/75/15 from the factory and I'm needing to replace one of the tires. Is it hurting anything by having the bigger size tires on it and should I replace them with what's on it right now, or go back to the factory size?

 

the size is perfectly fine

no it will not hurt anything having a little bigger tire

why would you want a smaller tire? even a 2wd needs bigger tires to fill the wheel wells

 

Just wondering if it screwed up the speedometer or anything. I really like to take care of my stuff.

 

It WILL change the speed you are going in relation to the speedometer!!!!! by 3% :P

from the factory they have a 10% margin of error, generally speaking the speedo will read faster then you are going so odds are it will be reading closer to your actual speed

just replace the tire(s) you need to replace