I just finished the clutch job on my 73 3000. Now the tranny engages first when letting the clutch out, then at half way up the pto starts turning. I carefully followed the manual, setting the allen screw gaps to .052". According to the book this determines the pto engagement. The clutch was normal before this. All I did was replace the tranny clutch disc and reassemble with original pressure plate, no resurfacing was done. I tightened up the pto clutch allen screws some to get the .052". Other than the two clutches engaging at the wrong time it all works good. Not planning to split it again, just wondering what could have caused this, especially since it was fine before the split.