There are heavy truck synchronized transmissions. (Or maybe there used to be!) Just not very common in North America. 20 years ago that was what they used in Europe. Volvo and Scania both had synchro transmissions. I have driven 6-7 different trucks with them. Took my license test in a Scania with a synchro box. Sent my wife for hers with an Autocar that had a 21 speed Volvo synchro trans. Just never caught on here and I guess got replaced by the auto shifts across the pond. For those that whine about using the clutch, all of these had air assist clutches that you could push the pedal with one finger.
Transmissions were plenty durable. That Scania I took my test in was a yard jockey, nothing but shifting all day long. It got a couple clutches through the years, but never had an internal transmission problem. Got retired with about 30k hours on it because the cab and frame were rusted out.
I think of the Volvo’s we had, only one had an internal trans failure, that one got towed without removing the drive shaft, and they twisted the top shaft off. It was a no no to do that. Always pull the driveshaft before towing a truck with a European transmission.
As to tractors, most current production is power shift or CVT or hydro. There are a few synchros in the economy models.
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