I am not sure, because I have a 5-speed manual, but do the auto Ts have a lockup torque converter? If so, maybe yours isn't locking up at highway speeds leading to overheating (lots of slipping at higher revs)? Again, I'm not sure if the autos have that but it might be a possibility. Good luck! <img src="/forums/images/graemlins/kewl.gif" alt="" />

'97 Extra Cab 3.4 4x4 5sp 90K mi and counting.
Mods: KYB GAJs, Monroe damper, Marlin shifter seats, Kenwood sound, bedliner, Leonard shell, ES sway bar upgrades, Aisin Hubs...Best truck ever
Currently listening to: Ryan Adams and the Cardinals III/IV
Currently fishing for: reds and trout