June 16, 2022
GM TH400 racing applications quickly push the heavy, cast-iron OE forward drum over its limits. To dramatically reduce weight and deliver the ultimate in reliability, Sonnax offers heavy duty forward drum 34554-01 — a high-strength, chromoly steel upgrade just 3 oz. heavier than a common aluminum drum. This video breaks down all the race-ready features in this unique transmission part, plus the heavy and extreme duty input shaft options for a complete Sonnax build.
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