Editing Ford Model TT (section)

==Drivetrain==
[[File:1926 Ford Model TT truck engine at Campbell County Rockpile Museum in Gillette, Wyoming.jpg|thumb|right|1926 Ford Model TT truck engine at Campbell County Rockpile Museum in [[Gillette, Wyoming]]]]

The rear axle of the TT has a [[worm drive]]{{sfn|Gunnell|2003|page=6}} and [[Crown gear|crown wheel]], unlike the Model T's crown wheel and [[pinion]]. The worm is located at the end of the drive shaft and above the crown wheel. The wheelbase of the Model TT is {{Convert|125|in|mm|0}}, compared to {{convert|100|in|mm|0}} for the Model T. It was often equipped with an accessory [[gearbox]], such as the [[Ruckstell]] or Jumbo gearboxes, which allow the truck to have intermediate gears between low and high, useful for hill climbing.

The Model TT was very durable for the time, but slow when compared to other trucks.<ref>{{cite web
  |url=http://www.txtransportationmuseum.org/collection-1924-ford-model-t.php
  |title=1924 Ford Model T Truck
  |publisher=Texas Transportation Museum
  |access-date=2015-03-25
  |archive-date=2016-04-17
  |archive-url=https://web.archive.org/web/20160417233459/http://www.txtransportationmuseum.org/collection-1924-ford-model-t.php
  |url-status=dead
  }}</ref> With standard gearing, a speed of not more than {{Convert|15|mi/h|km/h|abbr=on}} was recommended, and with special gearing, a speed of not more than {{Convert|22|mi/h|km/h|abbr=on}} was recommended.<ref>{{cite web
  |url=http://www.mtfca.com/books/ford.htm#trk
  |title=1923 Ford Dealers Data Book
  |publisher=Model T Ford Club of America
  |access-date=2015-03-25}}</ref> Standard worm gear ratio is 7.25:1, and special gearing gives a ratio of 5.17:1. Because of this, accessory catalogs offered items to help give the Model TT more power.<ref>{{cite book|last=Brooke|first=Lindsay|title=Ford Model T: the Car that Put the World on Wheels|year=2008|publisher=Motorbooks|isbn=978-0-7603-2728-9|url-access=registration|url=https://archive.org/details/fordmodeltcartha0000broo}}</ref>

It was replaced by the [[Ford Model AA]] truck in 1928.{{sfn|Gunnell|2003|pages=40–41}}