The Aussie carriers are usually 6.66:1, with a few of them being 5.83:1.
The 5.83 has 6 teeth on the pinion, and 35 on the crown wheel.
The 6.66 has 6 teeth on the pinion and 40 on the crown wheel.
As Tony says, the LP2 has a splined pinion, while the LP2A has a taper and key type pinion.
Yours is the LP2A, and my guess, a 6.66:1 ratio.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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