Fluid change before road trip?
 

So I'm planning a road trip in September. I plan on driving from south Texas up to Canada, then the upper pennisula of Michigan, down through Ohio, Kentucky, Tennesssee, and back home. The question is should I change the trannie & rear end fluid before I go? I changed the trans fluid to Pentosin & the rear diff to Redline at 6000 miles, and now have 30,000. So 24,000 miles on the fluid. Change, or go with it? I figure it'll be around a 6000 mile road trip.

If you're worried you might as well change the fluids.

My maintenance schedule (Canadian version) says to change the rear diff and manual transmission fluids every 32,000 KMs (~20K miles)... I'd do it before your trip.