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Allison Transmission is an American manufacturer of commercial duty automatic transmissions and hybrid propulsion systems. Allison products are specified by over 250 of the world’s leading vehicle manufacturers and are used in many market sectors including bus, refuse, fire, construction,...
transmission is a three-speed automatic transmission
An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...
used in several makes of transit bus including the RTS, Canadian-produced GM New Looks
The GM New Look bus, also commonly known by the nickname "Fishbowl" , is a transit bus introduced in 1959 by General Motors and produced until 1987. More than 44,000 New Look buses were built. Its high production figures and long service career made it an iconic North American transit bus. The...
, and Grumman Flxibles. Later production buses in the GM and Flxible line had the Allison V731 transmission, which is essentially the same unit but controlled electronically, with a keypad replacing the familiar shifter-lever in the driver's compartment.
The Allison V730/V731 family transmissions also come in versions with a built-in retarder
A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles....
(the VR731), and a version allowing transit agencies and others to use right-turning Detroit Diesel family motors (variously the V731R or V731RH) instead of the standard left-turning units found in Flxibles, GM New Looks and RTS equipment.
Most installations of the V730/V731 have them coupled to the DDA 6V92TA two-stroke diesel, but Canadian GM 'New Look' production T6H-5307's had them mated to the then-standard 6V71N. Some Canadian production 1982 "New Look" models featured the 6V92 mated to the V730, such as Vancouver, B.C.'s 1982 T6H5307 "Hillclimber" buses, all of which have now been destroyed except for the one example belonging to the transit museum "TRAMS."
In 2000, the Toronto Transit Commission
-Island Ferry:The ferry service to the Toronto Islands was operated by the TTC from 1927 until 1962, when it was transferred to the Metro Parks and Culture department. Since 1998, the ferry service is run by Toronto Parks and Recreation.-Gray Coach:...
started to retrofit New Flyer's 1990 D40HF buses from the ZF ECOMAT 500
ZF Friedrichshafen AG, also known as ZF Group, and commonly abbreviated to ZF, is a German public company headquartered in Friedrichshafen, in the south-west German region of Baden-Württemberg....
transmission due to failures. What they noticed is that due to the lack of the retarder which the Allison V730 does not have, the TTC should have retrofitted the transmissions with the Allison VR-731 which have these.