Tranny flush only vs. Tranny flush with filter change

[jwhjr]

I'm taking my 04 Silverado in on Friday to have the coolant and tranny flushed (60K miles). For $100 more they'll drop the pan and change the filter along with flushing the tranny. Is it worth it, or am I fine with the flush only? I haven't had any tranny issues, but I do a fair amount of towing/hauling, so I want to get some fresh fluid through the system. Any/all thoughts are appreciated. Thanks.

[jwhjr]

I changed the transfer case and differentials at 30K (and I added synthetic to the front diff as well), and I changed out the diffs again at 50K. I couldn't find a recommendation anywhere for when to change the transfer case, but at 30K the fluid still looked brand new (mine takes the blue Autotrak II juice). I just checked it again and it still looks like new so I'm not going to change it out again.