A dog-leg gearbox is a manual transmission shift pattern distinguished
by an up-over-up shift between first and second gear. The layout
derives its name from a dog's hind leg, with its sharp angles. Dog leg
gearboxes have fallen out of fashion primarily because most manual
performance cars now have six-speed gearboxes, which are unsuited to
the dog-leg layout.
Dog leg five-speed layout
Typical five-speed layout
Dog leg layout gearboxes are desirable on performance cars because in
road racing more frequent shifting occurs from second to third than
from first to second gear.
Examples of cars that have used this pattern for performance reasons
include the BMW M535, Early 635CSi (non-US) and (non-US) M3 E30, BMW
2002 Tii and Turbo,
Fiat Dino 2.4 (ZF Box), Mercedes-Benz 190E 2.3-16
and 2.5-16, Mercedes-Benz 300 CE-24, Mercedes-Benz CW311, Ferrari
308/328/348, Ferrari Testarossa, Porsche 914, early 911, 924 Turbo
Getrag gearboxes), Cosworth Vega, Porsche 928, Talbot
Vauxhall Firenza HPF, Lancia Fulvia, Lancia Stratos,
Lamborghini Countach, Maserati Biturbo, and De Tomaso Pantera.
Despite the performance benefits, non-performance-oriented cars
available with the dog-leg shift pattern were produced. Examples
include the Ford Model A, Subaru 360, Datsun 140Y (Datsun Sunny B310
Coupe), Datsun 160J Hardtop SSS, 74–77
Datsun 610 SSS, 78–80
Datsun 200sx, 1980
Datsun 210 Wagon (built during the 210/310
crossover), 78–80 Datsun 510, Citroën 2CV, Mercedes 190,
Mercedes-Benz 200D, Mercedes-Benz 300CE, Mercedes-Benz 320CE,
Mercedes-Benz E320 sedan -94, Mercedes-Benz 300SL (R129), and the
Oldsmobile Cutlass or
Pontiac LeMans with the 260 V8, the
Chevrolet Vega or Pontiac Astre, 76–79
Chevrolet Monza or
Buick Skyhawk or Oldsmobile Starfire, BMW E21, the 77–79 Pontiac
Sunbird and TATA Sierra in India. The early model Renault 4 had a
distinctive 'umbrella handle' dog-leg shift, which proved ideal for
urban driving, though the shift was later changed to the
'conventional' pattern. In April 2016, it was announced that the Aston
V12 Vantage S was to be offered with a 7 speed dog-leg gearbox.
Only 100 of the 7-speed manual
V12 Vantage S's will be produced for
the United States market.
Many light trucks (e.g. Iveco Turbo Daily) have dog-leg five- or
six-speed transmissions, because second gear is fine for normal
starting; first is considered a "crawler" or "granny" gear in these
trucks and is only used for starting with heavy loads and/or a
trailer, or descending steep grades. In many older trucks, the shifter
is marked with "Low" instead of "1", and 2nd gear is marked as 1st
instead. A 4-speed truck gearshift might read "R, Low, 1, 2, 3",
rather than "R, 1, 2, 3, 4", since the transmission is considered a
3-speed with an auxiliary low gear rather than a normal 4 speed.
The dog leg gearbox is typical of nine- and ten-speed heavy-truck
transmissions. In the case of a ten-speed transmission, the gears are
1–5 in the low range and 6–10 in the high range (the 1 position is
not used in the high range of a nine-speed transmission).
^ Paternie, Patrick (December 31, 1999). How to Restore and Modify
Porsche 914 and 914/6. Motorbooks. p. 107.
This article about an automotive part or component is a stub. You can
help by expanding it.