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Like the European-spec E30 M3, the sole gearbox for the E30 320is is a close-ratio Getrag 260 five-speed manual with a “dogleg” shift pattern and the following ratios: 3.72 (1), 2.40 (2), 1.77 (3), 1.26 (4), 1.00 (5). This is mated to a shorter (compared to the M3) 3.46:1 rear axle ratio with limited-slip differential.
