Re: 1966 c20
If you would clean and de-grease the box back down to the iron, it should be evident that some type of welch plug or threaded plug probably what Culver Adams was referring to once resided in that hole. More pics from other angles will help everyone walk you through replacing it. All that greasy stuff on the outside used to be on the inside until that cap or plug left the scene.
DAC
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Doug Crawford
Rapid City, SD
1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck
Hope to have a '60 GMC Suburban again someday
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