the slipping out of 3rd is wear - prolly syncros
rest sounds like clutch and/or linkage adjustment and worn syncros - pretty common condition for the 50s/60s 3spd's

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics