Bob,
The BWCR 11 is not an Arnolt gearbox but a gearbox used in the 405. The Arnolt gearbox is a BWCR 9 and does not have overdrive. The ratio of the Arnolt Bristol final drive is 3.9 and the 405 4.22 and the ratios of the gear box are matched to those. Unless you have changed the ratio of the Arnolt back axle your overdrive ratio is going to be very high.
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