transfer cases standard, the once-essential in-transmission crawler gear became largely unnecessary for the average driver.
Why It Faded From Consumer Vehicles
The decline of the granny gear in passenger vehicles was the result of 2 intertwined developments: the surge in engine power and the evolution of transmission systems. By the late 1980s, even a standard half-ton SUV possessed more torque and horsepower than a long-haul semi-truck from the 1950s. This abundance of power made ultra-low gearing redundant for typical daily use, while the standardization of 2-speed transfer cases with low-range options further minimized the necessity for a dedicated crawler gear within the primary transmission. This shift coincides with the overall waning popularity of manual gearboxes; by 2021, manual transmissions accounted for only 1% of new car sales in the U.S., with a minor uptick to 1.7% in 2023 supported by a dedicated enthusiast base.
Its Unexpected G Gear
The 1986 Porsche 959 boasts a 450-horsepower engine and serves as a German supercar that features an unexpected gear for difficult terrain. It utilizes a 6-speed manual transmission, but the shift pattern labels only gears 1 through 5, while the sixth position, located above first gear, is marked by the letter “G”. Porsche designed this “G” gear as a technical workaround for stringent noise requirements, not as a marketing tactic or design oddity. This modification allowed Porsche to secure legal approval for the 959’s sale in major international markets.
The Noise Regulation Problem
European pass-by noise regulations required vehicles to stay below specific decibel thresholds during standardized tests that measured sound at a controlled speed within a set zone. The sequential twin-turbocharged flat-six engine in the Porsche 959 produced remarkable noise; at standard RPMs in a typical first gear, it likely would have failed these requirements.
