Should I wait till I need a rebuild to upgrade my e4od?

[alpinhi]

Hey guys,
I have been wanting to do some performace upgrades to my truck. I have been putting them off since my trans is still holding up pretty well right now at 185k. The trans seems to be in pretty good shape, it does hang up before shifting into od every now then.(knock on wood) I dont plan on making huge HP with the truck but would definatly like to bring it to life. I was thinking about going on ahead and installing a new TC, BTS valve body, and bigger cooler. Should I just wait until it craps out or do some of these upgrades now? The truck is stock right now, except for a Tyamr intake and I do have 285's on the truck. The 285's are about wore out, so I think Im going to throw some 295's on it. I dont know if the tire size makes that big of difference like it does on the Jeep tranny's.
Thanks

[JSchuricht]

I wouldn't waste a TC on a transmission with 185k but the cooler and valve body would be a good idea.