went to truck fest a couple days ago and asked some questions. i have a 99 ford f250 single wheel 4x4, it has a 61/2" lift with 37" super swampers. this truck still has the original gears (3:55), one of the guys i talked to at truck fest worked for a gear company and told me i needed to go to 4:88 gear ratio with the tires other wise i am going to kill my tranny. the other guy was a friend of mine that work for 4wheelparts said deisels dont need gears and its a waste of money and to just go with a tranny cooler. what should i do?