The driveshaft is hooked to a gear housing on the top of the cart that corresponds to a receiver on the shaft of the blackbirds's J58 engine. In spite of the fact that each Buick engine produces almost 400 horsepower, they still need a 1:2 gear ratio on the gear housing in order to spool up the massive Pratt & Whitney turbojet engines. The Buick engines redline at 6000 RPM, and the J58s need a minimum of 3000 RPM to run under their own power.
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