On my 54 with 4 speed it has a 1/4 inch plug on top to top off the gear oil as gear oil needs to lubricate the u joint and when tranny oil is changed it takes time to make its way in there so there is a plug to fill oil so the u joint has oil and the transmission doesn’t go low .


1954 Canadian GMC 9300
"The Journey"
Follow in the DITY