73 Dart 2-3 shift problem

Hey guys. A friend of mine called me last night and said that the trans in his 73 dart, slant 6 is giving him problems. He said that it shifts solid in all gears, no slipping, tight into reverse, but that it won't shift into 3rd until he gets it up to about 55 mph. He said 1st to 2nd is right where it always was.
Is there an adjustment to make on one of the bands or something? My dad and i rebuilt a 727 years ago, but i don't remember a whole lot about it.
Any ideas?

Thanks