There have been LT85"S in going condition for around $500 on Ebay this year. One was advertised twice.
I just fully reconditioned one for under $900 - got the shafts & bearings etc straight from Ashcroft in England. The layshaft was OK to re use. Some get more damaged & cost more to recon.
Converting to 4 speed - I've done one- requires a different bellhousing, throwout bearing, slave cyl & rod, clutch plate, gear lever grommet & engine mounts, plus modifying the seat box for high/low lever.
Regards

