extremely soft 2nd to 3rd shift

everything i have read in my automatic transmission service group book on the 727, ( dont have one on the A-518) points to the rear clutch or over running clutch, But what is strange is the transmission is not slipping in any gear, it will pull good in 2nd gear and pull good in 3rd gear, it's just the shift from 2nd to 3rd gear is very loose and sloppy feeling but it still pulls fine and doesnt slip.