Can both these symptoms be a linkage adjustment? I rebuilt my '64, 833 - 4 spd using Passon's book and Brewers's rebuild kit. I also replaced the cluster gear with a NOS, all new synchros, and all six synchro dogs. I followed the book, and confirmed good cluster gear endplay. Now when shifting up from first to second, second grinds unless I double clutch. Shifting down from third to second is clean, but bumps out of second on hard deceleration. It didn't bump out before the rebuild. I can't be positive, as I didn't drive the car a lot before pulling the transmission, but I think that shifting into second from fist was a longer throw and felt more firm or secure in second. Just a different feeling now. I tried to keep the adjustment threads untouched when cleaning and reinstalling the rods. Thank goodness the rods were marked! Can a rod adjustment cure both issues? How may turns at a time and which way? The factory Service Manual talks about using a specialty tool to set neutral, but nothing about troubleshooting issues.