I performed a search, and no matches were found. Well the transmission shifts through all gears just fine as long as Im not stuck in traffic. When I sit in traffic for a while the problems start. 1st to 2nd slips (it feels like its shifting twice, it goes bump, bump then shifts), and the same for 2nd to 3rd. I have a shift kit in it that always shifts hard, but this problem just showed up recently. It will act like this until I shut it off and let it sit for a few hours. I installed a trans cooler, but this didn't seem to help. Any ideas???