Most Roadrangers have a 400-500 RPM difference between gears to accommodate the 1750-2150 RPM torque band of the older Diesel engines. That's way too many gears for a 292 with about a 1500-RPM or greater usable range between shifts.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!