I don’t know the exact engineering of a JD combine of that era, we ran IH. I do believe as a whole during those years the configurations of most all machines were fairly identical. Engine up top behind the grain bin, belts bringing the power down to the transmission between the drive wheels. So to shift the transmission long rods and linkage were use to transfer motion from the gearshift to the trans. I don’t know about the JD but the IH’s we had...101, 403, 715... all had three speeds. One rod would move to shift 1st and reverse, the other to shift 2nd and 3rd. Now the JD may have a 4speed trans. This would require 3 linkage rods, where reverse is the only gear shifted by one of the rods. So what I am essentially saying is have someone move the gearshift through all of those the gears positions while you watch the rods to see if they are ALL moving. If they are not then likely there is something not working right in the gearshift mechanism at the operators station.
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