thats what i am running in mine, but i dont do a lot of interstate driving so it works great for me. if you think it might be to low, your doner truck more than likely has a 700r4 in it and that will be perfect with your gear. but you could always trade it for a case of mountain due and a 3.08
i sure hope its a half ton truck, pop one of the hubcaps and count the lugs and hope for five.