I had several leaks in my automatic transmission. The repair shop charged me for work to install a new transmission filter and gasket kit. While driving home. I could feel that the automatic transmission was now shifting hard, and jerking a bit. Especially going from 2nd to 3rd gear. It was a long time bfore shifting into 3rd gear. And when it did, it was a heavy jerk before shifting. Is this some thing simple where the shop needs to make a few more adjustments. Or, is this a major problem??