Granny Trannies Guide

: Heavy-duty gearboxes frequently used in Ford and International Harvester trucks. New Process 435 (NP435)

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: 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

: 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. BorgWarner T18/T19 : In daily driving, these are

: 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.