Crankshaft
Casting# 480, 640, 865, 5480, 5865, 8640, 10055480, 10105865, 14088640; Heavy crankshaft used in all engines without balance shaft and with heavy piston and pin assemblies (745 grams). This crankshaft has two keyways.
Crankshaft
Casting# 480, 685, 5480, 10055480, 10105865; Lightweight crankshafts used in 1992-99 VIN code W engine, some 1995 VIN code Z engine and the 1996-99 VIN code X engine have light piston and pin assemblies (675 grams). This crankshaft has a single keyway.
Crankshaft
Heavy crank. Used with early heavy pistons. Except balance shaft engine. Forg. # 480,640,865,5480,5865,8640,10055480,10105865,4088640. Doesn't repl. Forg. # 255. Has no balance hole drilled by # 1 rod journal.
Crankshaft
Lightweight crank used with late style light pistons. Includes balance shaft engines. Forg. # 480,685,5480,10055480,10105865. Does not repl. Forg. # 255. Has a balance hole drilled by # 1 rod journal.