i've driven several trucks,(if not a dozen),of SM 420's through the years. if the synchro's are good,every gear should shift like butter. You just have to shift into "Granny",and reverse, when truck is parked,(or completely stopped),to keep from grinding gears. That's my experience.

Last edited by wetwilly5757; 12/22/2014 3:21 AM.
Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
In the Stovebolt Gallery
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It takes an awful big dog to weigh a ton.