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1 • 3 speed gearbox - external parts All BN1
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2 • 3 speed gearbox - internal parts All BN1
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3 • 4 speed side shift gearbox - external parts All BN2, BN4 and BN6, BN7 to 16038 and BT7 to 15880
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4 • 4 speed side shift gearbox - internal parts All BN2, BN4 and BN6, BN7 to 16038 and BT7 to 15880
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5 • 4 speed middle shift gearbox - external parts BN7 from 16039, BT7 from 15881, all BJ7 and BJ8
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6 • 4 speed middle shift gearbox - internal parts BN7 from 16039, BT7 from 15881, all BJ7 and BJ8
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7 • A-type Overdrive BN1 - external parts
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8 • A-type Overdrive BN1 - internal parts
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9 • A-type Overdrive BN2 to BJ8 - external parts
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10 • A-type Overdrive BN2 to BJ8 - internal parts
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11 • Gearbox mountings