Once an a while it will shift late (over 2500 rpm's)while normal driving.No codes,no idiot lights.no flashing of lights. Thinking..ECM. I changed the transmission fluid and filter.This helped when the problem would happen the shift's were not near as agressive after the new fluid. When the fluid was changed it smelled burnt,but in the two years I have had the truck it has not ran hot.Does have a trans cooler also. 94 f350 460 supercab duelly. 114000 miles. Like I said this is intermitant as of now,really only on the way home from work. Noticed the heater control switch was leaking vaccum when in the off position today, going to see if a change there will make a differance. The only thing I do differant on the way home verses going to work or going out, is the heater control is turned off.(the truck sits in the sun all day it is hot inside a black truck no need)