727 trans rebuild

You need the kickdown band loose. It doesn't have to be adjusted correctly, just loose enough to allow the clutch packs to move freely.

You didn't change any hard parts did you? Like the front pump or clutch drums. I haven't seen any with that much play unless parts were mismatched. It's either that or something is missing like a thrust washer in the gear train. I can't think of any reason it would have that much slop. The thickest thrust washer I have ever had to use was .108 and that got it tight.