Callies Performance Products Duramax 4340 Forged DS Crank 3.898 Stroke H76903FXXL Extension sits 5" into the

Extension sits 5" into the spring

2-1/2 in Slot

This item fits both 2-door and 4-door models

Abrasion resistant cover will not crack or harden

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Callies Performance Products Duramax 4340 Forged DS Crank 3.898 Stroke H76903FXXL Extension sits 5" into theProduct Description: Crankshaft Durastar 3. 898 in Stroke Internal Balance Forged Steel GM Duramax Sold Individually Callies Performance Products began manufacturing high performance crankshafts in 1989. With many years of engineering and employee experience, Callies has grown to be the industry leader for innovative product design. Callies Performance Products takes pride in staying ahead of the competition with the latest high tech design and