New generation box
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:ATON'S 3305 five-speed transmission — launched at the Motor ;how — is the first of a whole new generation of five-speed gearooxes designed and built for mediumweight lorries in the 10-14 onne (9.8 to 13.8 ton) gvw range up to 20 tonnes (19.7 tons) gcw.
It has a torque capacity of up 3 450Nm (330 lbft) and is synchomesh apart from first reverse ears which are constant mesh. aton says that this simplifies peration and puts an end to hipped gears, but the option of synchromesh first gear is availble.
The 3305 can be specified with either a direct or overdrive top gear, and in both cases it has a conventional gear shift position.
There are in fact three different sets of ratios available, one for the overdrive box and two for direct drive. These are listed below.