I had the rear end on jack stands and the front wheels on the ground while I was doing rear suspension work (shocks, springs, cv axles). I kept getting interrupted and left the car in that position for about 3 - 4 weeks before I finished and now the transmission feels like it's slipping. I've never had transmission problems and I changed the fluid and filter a few months ago. No fluid leaked while the car was jacked. Was it a bad idea to leave the car in that position for an extended period of time? I'm not sure how to troubleshoot this, any suggestions? Thanks.