James, take the lid off of the gearbox. the selector shafts (3 in lid)may have rusted due to condensation. make sure the forks are correctly engaged. Try shifting each gear to neutral with the lid off.
The ball on the bottom of the gear lever may also be seized. This may break if you force it.
Removing the lid will help to isolate the problem. I don't think it will be jammed, due to the rotational load, as the motor would have rotated to a "neutral" position.
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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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