I figure you hotrod guys know your motors, so I have a quick question...

I have a 78 GM Chassis motorhome with a 454 w/4barrel carb and 3spd auto trans (turbo400 i think) with 4.68 gears (dana 11?).

At normal throttle, it will shift into 3rd at about 25mph. 60mph is a long way away from 25mph and i'm all out of gears! At 60mph it is rev'ing about 3200rpm.

I've been contemplating throwing a set of 4.10 or even 3.73 gears to improve mileage, but I'm curious as to if it is even worth it?

Is 3200+rpm ok for these old 454's? I have a 12hour drive planned in a few weeks, and I know 3200rpm is ok for a little 4cylinder, but a big 454 seems a bit high.

Thanks for the advice!