Do you think that something is broke or has it been sitting a long time?

Also a C-60 will usually have a 4 & 2 or a 5 & 2 or sometimes just a 5-Speed trans. If you can't find any signs of a button on the shifter look at the rear itself for signs of a 2-Speed.

Bill


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan