In Reply to: Re: Double shifting unsynchronized manual transmission posted by Kirk-NJ on April 25, 2020 at 04:38:46:
I do it all the time. Trick is sound of RPM of motor to about sense of forward speed. With a full load behind on any of my tractors 4 speed, I start out down the road in 3 rd-push clutch in- move hand throttle down to almost idle-put in 4th without grinding-let out clutch-move throttle for power.
I would call it "seat of the pants feeling" instead of double shifting