2010 auto trans lt shifting hard
So my 2010 LT is shifting hard into drive from a standstill and seems to either hard shift or skip between 1st and 2nd. The revs seems a bit higher too. Last time I had this issue was right after I changed to tranny pan gasket (had a leak) and I had driven a few miles. So the question is this: could it be possible I didn't get to fill it all the way? The gasket job was about 6 months ago. or am I looking at some new evil here?
All help is greatly appreciated.