In relation to an earlier posting...I just had the radiator pulled and cleaned (guy said he didn't find much in the radiator) and the thermostat replaced. The truck tends to run too hot (between 200 and 250 on the guage when pulling up a steep incline. It also runs hotter ( maybe 2 indicator needle widths past 200) when pulling a load in city traffic on a hot day. When it does this, it causes the auto trans to shift hard with a screeching sound and I don't want to tear up my transmission. This is why I took it to the radiator shop (a very reliable shop) and had him check it out. Today on the way home I had the truck in cruise on the i-state at 70mph and the temp stayed right at 200. The only time it started running cooler was on the backroads near my house in the country at much lower speeds~40 mph. It also ran much cooler idling. Question: Can the 195 thermostat be replaced with a 180 in this truck without any problems??? And would this help?