I've got a Syncro tailshaft for sale if anybody's looking. Uni's are good, it's the inner bushing in the rear shaft doughnut that I couldn't get to. Has some vibes around 60km, smooth after that. You can replace these bushes with a poly bush from this mob : https://www.igus.com.au/Contact/General/AU
You're looking for part number GSM-2528-20 for the outer bearing ( which I replaced ).Inner bearing is a cap bearing not sure part number, or how to get the old one out etc. If you have the tools to do it you get a cheap prop shaft for $100.
Attached is a little known feature of the Syncro.. The door latch beer opener. Life saving device !