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Are you sure it is the rear main? Could be rear cam plug or back of intake or one of the rear plugs for lifter oil passges. When you have trans out check all these first.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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