who said ya shouldn't, Rich? you may be confused about folks saying you won't keep up w/ freeway traffic - 55 for long periods is no picnic in these ol trucks cuz they're harsher sprung than the cars, and a bit noiser, but they can take it - unless you're running an original driveline w/ mucho miles on it already, in which case you should be carrying some spare parts along!
a better rear ratio will give you the ability to keep up w/ 60-65mph traffic at slightly lower rpm than you'll be doin at 55 now, and the lower rpm will have a positive effect on the longevity of yer ol engine
Bill
