Make sure your clutch freeplay is right (10-20mm). If the clutch is dragging, it will tear up your synchros as they fight the clutch.
Same thing when choosing which clutch disc to use. Donīt use the heavy types (black magic etc.), if you intend to help your synchros live long. Most people donīt give this much thought, but in theory light and small clutches should shift faster/easier and not wear the synchros as much.
Ras
intresting observation.
so what would be less harmfull in the end, a stronger pressureplate with a stock disc or a stock plate with a harsher disc (just putting out two extremes here as an example)
Think about what happens when you put your clutch pedal to the floor.... Then the transaxle mainshaft only has the clutch disc "attached", and when you try to engage a new gear then the synchros have to speed up/slow down the gears/axles/clutch plate. Lighter/smaller parts will make the synchros job much easier and it will happen faster easier. IN THEORY.
Again, many people donīt give this much thought. But when you speedshift your gears with a heavy clutch, chances are you will warp/bend/wear your synchros much more than normal use will.
If the small bearing inside the crankshaft (for centering the transaxle mainshaft) is bad, then this will wear the parts too.