727 shifting into third slow

Ok it's got a trans go shift kit. Bb 727. First is good. Second is good. Reverse is good. All hard shifts. Third basically just slides in but have to let off the gas so it goes in. Fluid looks good znd clean. Levels were fine also. Dropped pan and nothing in it.
Before I pull tranny is there an adjustment I can do. Lokar cable is adjusted correctly.
Thanks

John