- Mar 1, 2015
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New member here, tearing down C4 tranny for inspection, seal replacement, etc. everything coming apart nicely, low mile unit. When I pulled pump assembly out with forward clutch assembly as expected. When separating the pump and shaft assembly from clutch assembly , a bowling pin shaped pin 5/8 inch long by 1/8 inch diameter. Gone crazy with drawings and schematics, where did this come from?