My 56 split trans needs a rebuild, so I installed a 59 I had as a spare that had been "rebuilt" prior to me getting it. It shifts into 1st, 2nd and reverse nicely. I can find third but does feel like it's going in completely. Will not go into 4th, and when it's in neutral it still feels like it's in gear (doesn't roll freely and spins the crankshaft). Any ideas out there? I have tried adjusting the shifter.