Trans when hot?

[mftd1975]

Sorry if this is covered some where else.
I have a 2008 4x4 xlt with 4.0 with 125xxx
The vehicle drives and shifts fine under normal driving in 2 wheel or 4 wheel and when towing. The problem is if its a hot day 95 (F) or so or when I am driving in the hills a lot the transmission starts to get loud. It doesn't slip but sounds more like a stall converter waiting to shift. I had the fluid and filter replaced at 75,000 miles. I was going to do this again but the local shop said it would not fix the issue. Thoughts and comments please?

Thanks for any help and suggestions.

 

[Mickalo]

hows the trany cooler is it stock? may need a bigger cooler if pulling allot of weight also have you tried disabling the O/D when pulling loads up and down hills.

 

[mftd1975]

This problem is when its hot out side or after long driving, not isolated only when towing. It is all stock how ever.

 

[Mickalo]

check to see if the trany fluid smells burnt make sure the trany cooler isn't clogged up I believe it's behind the radiator on the pass., side

 

[transman304]

Clutch fan bad?