Overdrive Transmission - Mopar Overdrive Conversion Kit
This cluster gear comparison shows how the Passon gear (bottom) is machined from 9310 steel versus the 8620 steel used in stock Chrysler gearsets. The replacement alloy is harder but has a specific heat-treatment process that adds forgiveness to prevent fractures. Jamie Passon tells us he has sold more than 60 OD conversion kits, including one to former pro wrestler Bill Goldberg, whose Hemi Dart can't break it.
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