D7e trans runs warm. Plugged cooler possibly?

I am not experienced in that particular one, so I can't say definitively. But if you can check the oil line temp of the inlet and outlet from the heat exchange, it would give you an idea if any cooling is happening. Also, if possible a backflush of the oil cooler into a clean bucket would give more info also.
I hope someone didn't put the wrong oil into it along the way and have friction linings coming apart now.

Hi Drew, Check the torque converter scavenger pump. To check it remove the drain plug at the bottom of the torque converter and note the amount of oil drained. A large amount of oil indicates a scavenge pump problem. Check the strainer screen next to the drain plug also.
There is a service manual and all the other manuals for your D7E (even sales brochures) in the ACMOC library. You need to become a paying member to access them.
Craig

I’ll definitely be joining the club.  I didn’t realize you guys had service manuals online.
about the scavenger pump,  does it get weak and then the oil stops flowing through the cooler then?  Also is it easy to replace or rebuild?

thanks 

Hi Drew, If the scavenge pump fails to remove enough oil from the torque converter housing the torque converter will be flooded with oil and the friction of that will generate heat. The scavenge pump is easy to get to.   
When you have access to the library be sure to have a look at the OMI, they are listed as "Operator Instructions" in the index. The OMI contains much valuable info.
Craig

From my experience, either the water tubes in the heat exchanger are somewhat clogged or the converter seal rings etc are worn and letting out too much oil for the scavenge pump to cope with, I have never had to replace or repair a scavenge pump, however had to re race and re seal a number of converters.

Regards, Wombat