Never drove a heavy truck with a syncro, just non sync boxes. Keep in mind a road ranger does have synchros....on the air shifted range change, i.e. 5th to 6th on a 10 speed, the switch flick is syncronized with an air shifter moving it, the main lever throw is not.
Crash box in a tractor is different story.
I run both synchro and unsynchro tractors, in road haulage no real difference pulling rolling loads on a hard surface at speed, but I don't have to clutch the unsynchro tractor, just float the gears like a heavy truck.
In the field, the crash box is a pain, very rarely can you make a shift on the move, must come to a complete stop. Synchro tractor stab the clutch and move the stick. Can even do that with a non rolling load if needed.
Powershift really shines in tillage work, upshift and no interruption of power, just accelerate, sync and unsync you come to a stop the moment you clutch.
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