[flipscobra]

When I first got my SPF with a 427 FE I had the same trouble an you could not shift it above 3000 rpm, it was not releasing. I tried bleeding it an near about wore my wifes leg out. I finally ordered a new MC an when I took the old one out an compared it to the new 1 I saw what was wrong, they left the oring that goes on the remote resavoir off, then I bought a pressure bleeder an bled the system an have not had a problem since. It has 2 remote reserviors 1 on the firewall an 1 under fender by the brake mastercyclinder. You might check this it could be your problem. Flip