Just put my 35X15.5X15 swampers on and now my truck feels SUPER sluggish...so Now I know I gotta re-gear, question is which gear ratio to go with?? Im currently running 3.42's with a TH350 trans. I was thinking maybe 3.90's?? but is that gonna be enough or Will I have to jump to 4.11's? Also, what is the Redline RPM for the 6.2l diesel??