727 doesn't shift into second gear like it should

UPDATE. I drove the car today and it shifts awesome. The mods to the rear servo worked. After I verified the 1-2 shift was working good I went down a back road and came to a stop. I put the car in 1st and nailed it, tires start spinning, car is going a little sideways then I hit second and it shifts so quick it is still laying rubber. Now I am happy.

I want to thank everyone here that commented on my thread to try and help. THANKS FABO MEMBERS.