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Differential ring gear and pinion - FIAT 124 Spider and Sport Coupe 1969 to early 1978.
4.1:1 (41/10) ratio.
Lowers engine rpm by approximately 5% compared to the 4.3:1 gears that came in most Spiders, resulting in quieter highway driving and better fuel economy. Especially nice with modified engines. For front loading differentials.
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