The stock Alfa gears are heavy and wear the synchros early. The usual cure is to have the gear machined/lightened. Many thread already on this. Do a search and you'll find lots of info. I'm not aware of any "uprated" synchros.
I agree that it's easy to remove the gearbox. (This also makes it much easier to remove the motor if you are working without a lift.)Jim,
I am fan of taking out the gearbox on its own, without taking out the engine.
The only tricky part is undoing the gearbox to engine 13mm nuts, at the top near the transmission tunnel.
I find this to be a tricky, but not impossible.
Take out the driveshaft, gearbox mount, reversing wires, stick your jack underneath the gearbox, (I use a tie-down to attach the gearbox to the jack)and pull.
NB - If you don't use the tie-down or rope to attach the gearbox to the jack, it could fall on top of you!!
Good Luck
Ian
1750 GTV's.
I bought a transmission jack (less than $100) and now I wonder how I did without for so long.