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Rear Crankshaft Sleeve (SS339) by Enginetech®. The Engine Builder's Source, can locate the right part for nearly any rebuild application. Offering a full line of internal engine parts for domestic, import and high performance applications, Enginetech products are manufactured only in high quality facilities with ISO, QS & TS quality systems in place. Offering a full line of internal engine parts for domestic, import and high performance applications, Enginetech products are manufactured only in high quality facilities with ISO, QS & TS quality systems in place.