APT wrote:
Would 3.73/4.10 gears be better? Yes, but $1500+ with 4WD on an 8 year old truck doesn't seem like a wide investment. Save the $$$ until you can replace it with one that has 6+ gears in the trans.
Same thing was told to me back in 2006. Spent $3,000 as I also upgraded both differentials to limited slip Truetrac. Truck is still running and pulling great. Sand, mud, snow is also much improved. The OP just needs to decide if he will be keeping the truck another 5+ years. Lots easier to keep driving it when it is working well.
For the OP, I agree you should get an auxiliary transmission cooler if you currently just have the integral transmission/radiator cooler.