Good spotting Grunf
Moved from Gen 8 engines to Gen 7 drive train components
Yep - good idea to drop the fluid after 98K - especially if hasnt been done before.
Let us know what the fluid looks like - better still post a pic if you can
All things trans cooler related here: Trans-cooler stuff
How to flush your 4 speed - link and location on last post. Details for correct fluid in the Auto Trans Service thread4 speed auto
Get your self a cooler before the flush if time is on your side - will just save some dicking around, spilling fluid and topping back up to correct level at a later date
Davies Craig 678 coolers are a good common option.
A good thread below:Auto trans cooler - does size matter?