904 help, won't move

According to the manual fluid change with torque converter is 8.5 quarts. Added to 8 quarts, fluid level is 1/2 way up the dipstick tube. Pump sprays fluid out of the cooler line at the radiator. Drops into gear both drive and reverse with a light thump, but won't move unless revved up quite a bit. Is there a possibility the torque converter isn't filling? That is the only thing I can think of that would cause the high fluid level