89 tristar trans velvet drive 1:1 problems?

[jwasch]

I took my tristar out to the lake today. I noticed that under a good hole shot attempt that the trans felt like it slipped then catch the gear. the only time i could get it to do this was pulling a ski or wakeboard from a stop. i usually try to baby my stuff but with bigger guys behind the boat i try to give it a little more to get them up quicker. any thoughts or advise would be appreciated thanks.