Ring and Pinion
#11
#12
Thats your personal preference. If you just drive the truck with occasional towing leave the 3:55 in both. But if you tow alot of heavy loads swap the rear to 4:10.
#18
It would help with towing. I have 3.55's, and when I have my holiday trailer in tow, I wish I had 4.10's. Empty on the hiway is a different story. RPM's are nice and low, good mileage, less engine noise, it's really nice. It's a toss up of what you want. and what you are willing to sacrifice.
#19