That hole is for a crank. It was stashed behind the seat, If we needed a crank we would walk 2 miles to find a deuce and half to come give us a tow before trying to use it. Dec-Jan 1953-54 we, King Co. 511th Abn, 11th Abn Div was at Ft Carson and Camp Hale for winter maneuvers. We had a drop for the locals and the 3/4 ton from King Co was selected as one of the equipment drops. It streamered. Watched it on channel 5 news that evening. Klcked up a dust cloud you wouldn't believe. Got a new M37 out of it. The winch, when so equipted, was driven from a PTO attached to the transfer case.