We pulled a 41' 610  8" deep with a 9400. It was more than the tractor wanted at times but got by. There's no way regular shanks would run that deep. 8" is about all the further they'll go and stay down where they belong here. Not sure if the tru-depth were around for the 1610s or not. 1610s are older than the 610s and I know they were offered on 610s.