From lock-up automatics to race-ready six-speeds, these overdrive transmissions reshaped street performance, diesel builds, and modern muscle’s success at the dragstrip. There was a time when ...

The price of street gas being what it is, even the most hard-core hot rodder must grasp the consequences. Certainly, they can curtail driving to reduce fuel cost, which often precludes traditional ...

Over the years, the trucks have certainly become more sophisticated. Take transmissions for example. At one time the only choices were "three-on-the-tree" or "four-on-the-floor" manual boxes. When ...

The last nail in the coffin was technological advancement.

Ford's Automatic Overdrive (AOD) transmission arrived in 1980 in full-size Fords, Mercurys, and the Lincoln Continental. As the AOD became available in more applications during the 1980s, including ...

Direct drive or overdrive? That’s a years-old question among truck operators concerned with spec’ing transmissions: Should top gear be a direct 1 to 1 ratio, where the output shaft spins at the same ...

Since the health of our planet became a major societal focus decades ago, automotive engineers have been on a mission to find a balance between performance and efficiency. In the past, the two ...

Automatic transmission cars have the Overdrive (O/D) function which allows a driver to drive faster on the road. The o/d is the highest gear in an automatic transmission. The overdrive function ...