727 doesn't shift into second gear like it should

Im not expert. But from all ive scene with adjusting bands. Is you snug them up with a short wrench. Then you BACK off 2 1/2 turns (depending on what your kick down lever is) Then you Tighten the lock nut down. There is actually a torque spec. 72 Inch lbs on the band then back off 2 1/2 turns.