artic-z28

I got this tranny from rock-on awhile ago.. I installed the TC and it was leaking. So i parked it for awhile, just got sick of working on cars needed a long break. Now im back.When I was driving I noticed how sometimes it its the rev from 1st to 2nd. I barley have 60 miles on the tranny since installation. but I only gave it wot a couple times.. Since my front seal is bad does that cause pressure problems and causes it to shift incorrectly or is it because of my vig 3800 stall? the car was tuned for a 3200- 3400 stall.. "new stall"