Trucker here.
Like the above posters have pointed out already, you could have any combination of gears being synchronized. In most cases, the ranges are not synchronized and have to be shifted while stopped. I tried it once on a model to keep shifting while moving. No chance.
As far as I can remember, a JD 5M has the higher speed ranges synchronized up and down.
The gears in each range are usually synchronized up and downshift.
The clutch needs to be used for all shiftings. Some models have a declutch button on the shift lever. That can be used instead of the pedal but can not be feathered like the pedal.
It's an entire different animal compared to an Eaton.
Like the above posters have pointed out already, you could have any combination of gears being synchronized. In most cases, the ranges are not synchronized and have to be shifted while stopped. I tried it once on a model to keep shifting while moving. No chance.
As far as I can remember, a JD 5M has the higher speed ranges synchronized up and down.
The gears in each range are usually synchronized up and downshift.
The clutch needs to be used for all shiftings. Some models have a declutch button on the shift lever. That can be used instead of the pedal but can not be feathered like the pedal.
It's an entire different animal compared to an Eaton.