Given a similar size gearbox a 6MT would be stronger than a 7MT because the gears on a 6MT are physically thicker. The extra set of gears on a 7MT robs space so generally the gear sets are physically thinner. I remembered back in Group N rallying and drags people op for 5MT on the Evos and STis because they ate physically stronger (running thicker gears) than the 6MT
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