q.1 - A + heater on (and windows down, if ya know what's good for you <img src="/forums/images/graemlins/evil.gif" alt="" />)... Hadn't thought of turning on the a/c as well; Makes sense...

q.2 - You mean 4th gear, right? IIRC, OD just stops the torque converter from unlocking... Doesn't keep it out of 4th. And yeah, keeping it off definitely helps it from overheating the tranny. Good idea to turn off on any long grade or high headwind, especially with 35's & stock gears.

Anybody have recommendations on a good, h/d tranny cooler? Something I've been considering for a while too... <img src="/forums/images/graemlins/cheers.gif" alt="" />