I have read several threads about transmission temps but have not seen anything that tells me what is the upper limit. I have a 2007 3500, juice with attitude, Banks cold air intake, K&N air filter, and Tyledyne cat back. When pulling my 34 ft 5th wheel (10,000 lbs) and the outside temp 90-95 deg F my trans temp reads as high as 202 in a long uphill pull. Without the trailer it runs about 190 with the same outside air temp. On "cooler" days it's 185. What's too high?

Thanks.

 

6.7 or 5.9?
68rfe or 48re

 

5.9 Cummins

 

the basic rule is too look at it just like your coolant temp... around 250-260 is getting too hot, but you are fine where you are at, if you start pushing around 230 or more, you might think about an aftermarket cooler

 

Yup, you're just fine and that is totally normal.

Up over 220 - 230 is starting the get hot, but under that you're okay.