yes, what ^ daddy says, a stock shortbed [1/2T] should have a 3.90 rear ratio and should do 70 in high gear - do you have the gas pedal to the floor at 50? or maybe you think it 'tops out' because of the sound?

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics