I am sure it is due to the size tires I have on my truck, but my speedometer is always 10mph over. Just wondering if aside from changing the size tire (30x12.5) is there a way to make the speedometer accurate again?

 

change your gearing in the diffs, but it seems like you're looking for a cheaper alternative

 

Nothing on my yota has been cheap, I don't believe in cheap fixes anyway they usually cause more trouble than they are worth

These are my first big tires, in fact when I drove her home for the first time I was informed that I was 85mph when I thought I was doing 75mph and so on...LOL. I was trying to figure out why I kept having to slow down to let them catch up, you know car vs beat up truck...duh, lucky I didn't get pulled over.

No I was just wondering how to fix it. Until now I have not had to do any clutch or tranny work so it is unfamiliar territory to me that's all. I love her big tires and don't want to take them off.

So what is involved with changing out the gear ratio and is that going to change her gear ratio when she is 4 wheel drive?