If it's the o.e. vintage it should have a round cover on the rear (drop out 3rd member), fill plug is in cover. if something else, post pic.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022