Easy, precise shifting and no ham-handed abuse or showy 'getting-air' allows higher torque without breakage. Jr Wilson shifted slow & easy in his SS racer and had quite a run of successes with a 900-bhp big-block racer. In the past, Lloyd has made up critical ZF gears of even higher-grade steels than Ford specified back in 1970, for racers who routinely abuse their cars. Note that these upgraded parts are still 'real ZF gears' as supplied from RBT. And a ZF cooler may be of some value in real 1-hr-or-more races.
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