: Heavy-duty gearboxes frequently used in Ford and International Harvester trucks. New Process 435 (NP435)
: Renowned for having one of the lowest first gears (7.05:1) and the shortest case length, making it ideal for short-wheelbase vehicles. Muncie SM465
: The first gear ratio is exceptionally high (often around 6.5:1 or 7.0:1), providing immense torque for starting heavy loads or crawling over obstacles. granny trannies
: Another legendary "granny" box favored by Ford and Dodge enthusiasts for its 6.68:1 first gear. Other Contexts The phrase occasionally appears in other niche areas:
: A later, slightly larger version commonly found in GM trucks from the late 60s through the early 90s. BorgWarner T18/T19 : Heavy-duty gearboxes frequently used in Ford and
These transmissions were staples in 20th-century pickup trucks and are now highly sought after for off-road Jeep conversions: Muncie SM420
: In daily driving, these are typically operated as three-speed transmissions. Drivers start in second gear because the "granny gear" is too low for normal acceleration and often requires the vehicle to be nearly stopped to engage. : Another legendary "granny" box favored by Ford
: These units are known for being massive, heavy, and extremely strong compared to standard passenger transmissions. Popular Models