A lot of us want to keep our trucks as original as possible and, at the same time, improve the safety and performance to drive comfortably on today's roads. Along with brake upgrades, wringing more horses out of our flatheads, adding seatbelts and tightening up our suspension components, many of us have asked--how can I cruise at 65 while keeping the RPMs in a decent range? The three "big" solutions that stand out are a- swap transmissions for something with an overdrive, like a T-5 or an A833,