A few months ago I swapped from auto to a s47 zf5. The zf had 300k on it and has been grinding from the 2-3 up shift and the 3-4 down and 3-2 down since I installed it. I have put 7k miles on it like this being carful to shift real slow on the 2-3 and 4-3 but it is basically impossible to shift into 2nd over 5mph. Before I drop a bunch of cash on a reman is there anything to check like clutch master/slave to make sure it is all working proper? Everything feels good to me. I put in a new pre bled master/slave cylinder when I did the swap. I am thinking about rebuilding myself if you think new syncros, bearings, rings, ect is all it needs. How hard of job is it? Special tools needed?