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A-Overdrive Austin-Healey BN1
Technical Specifications
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With centrifugal switch
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Up to model year 1955
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28% reduction
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Optional 22% reduction
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A-Overdrive Austin-Healey BN2,4,6,7 / BT7 / BJ8
Technical Specifications
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With round flange
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22% reduction
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Gearbox Austin-Healey BN4,6,7 / BT7
Technical Specifications
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Side shift
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3-speed synchronized gearbox
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From model year 1956 onward
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Clutch operated hydraulically
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Gearbox MG Midget / Austin-Healey Sprite 1098 cc / 1275 cc
Technical Specifications
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Ribbed gearbox casing
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For models with 1098cc and 1275cc engines
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Gearbox MG Midget / Austin-Healey Sprite 948 cc
Technical Specifications
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Smooth gearbox casing
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For models with 948cc engine
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