Second Gear Band 727

There is never any overlap on 1 to 2. Drive/First uses the forward clutch, and low 1 uses the forward clutch and low/reverse band. Most sift kits and valve bodies do not use low/reverse unless you specify. Which means when 2nd gear applies, the fluid goes thru the accumulator to the kickdown servo. the clutch never disengages. Is the slipping going into 2nd? What servo package did you get? Was the pump replaced when the trans was rebuilt? What lever was used in it?