I just thought it would be nice to have 5th gear. I'm really revving the motor to go down the freeway with the 4speed
dont worry about the revs, i used my truck as a daily driver when i had a 80 mile one way commute for a year, i sped along at 75 mph and near 4000 rpm, never looked back
these engines are fine up to 4000, infact i always got my best mpg around 3400