The Stovebolt Site Forums The Shop Area Engine Shop 465 second gear synchronizer replacement ?

hi, does anyone know about replacing second gear synchronizer ? does the tranny have to be out of the vehicle to do this ?
what all is involved ?
i have a 465 trans that will not go into second gear anytime the truck is rolling/moving,
until it is fully stopped

or does anyone know of a good 465 for a 1 ton 2wd for sale in central IL ?

thanks for anything