Unexplainable Transmission Stutter... help?

Oh also the transmission is just a couple hours of work to be fully completed. We installed 4 thin discs in the front clutch. Our clearance was pretty tight and a little under the tf book specs. We called a Chrysler mechanic and we were told we would be "a ok" just that going from park to drive it would engage into gear quicker and would not cause any transmission problems