bnav8or

65' Mustang with 200 and c4 tranny. Did a complete rebuild of tranny. Worked fine except for a leak from the front seal. Dropped it, replaced front seal, put it back. Now it stays engaged in a forward gear in Park or Nuetral. I can start the engine but you can tell it has a load on it. If I try to increase rpm it wants to go. Thought I connected the shift a little off so I disconnected shift altogether. Manually moved selector from P to N(2 clicks), still staying engaged. Checked fluid level and connections. Everything seems ok. Any Ideas?