Yes wiix, just be sure you tighten the clamp nuts at the sides of the clutches properly so there is pressure on the shim stack when you check for drag. Of course you check for drag by holding the two ends of the axle, resting the outside of the clutches on the bench, and pulling the axle back and forth across the bench. Make the shim stacks the same on both sides, so it operates symmetrically. There is no need to put the axle back into the machine until you have the shim stacks right.
I hope you've checked that there is plenty of lining left on both clutches: if they need to be re-lined, now is the time to do it. Once you have the clutches set up properly, if there is slippage, it will be happening somewhere else. In particular, if you have slip going forward, but not when reversing, chances are it is belt slip. That mostly happens because the automatic tensioner is not taking up the slack properly. You can find an explanation of that, and how to fix it, in this recent thread:
https://www.outdoorking-forum.com.au/forum/u...rds=Greenfield&Search=true#Post58032
