i am in the process of buying a 99 F250 crew cab, 4x4, 8 ft. box. with 250,000 miles on it. the truck now has the edge evelution in it but i would like to get the TW 6 position. do you guys think this would do more harm to the truck than its worth or do you think itll be fine. obviusly i would get egt, boost, and trans temp guages as well. also there has been no problems with the tranny and the truck has been well maintained. thanx for the input.