Ok guys, my 69 bird has a recently rebuilt m21 with a hurst comp plus shifter. Any time i shift into reverse.....l have to struggle shifting back and forth in 1 to 2 or 3 to 4 before the car will fully disengage from reverse. It is like it get stuck in between reverse and forward gears.....i am assuming it is in shifter. It did same thing before trans rebuild.....other the sitting still for 10 sec shifting up an down everything works very well.. Ideas.....?