I have movement in my gear shift only in 1st and 2nd.. 3rd gear no matter how hard I try to make engine Jerk for movement in shifter it wont.so motor mounts are fine. Only movement in 1st and 2nd. Tranny just rebuilt new gears and synchro. It did this before rebuild. Ideas? Video attached .

www.youtube.com/watch?v=1DdRijTdHh8

 

Of course in video I'm using low speeds and am on and off gas to make the movement. But even 3rd gear and 4th if I do same thing there is no movement. Cables?