Personally, if they don't install a dipstick, then they should take full responsibility if there a leak and the transmission runs dry. I put my truck in the shop, when I got it out I was told I had a power steering leak. I bought a quart of power steering. When I checked it, it had been overfill. So I waited, checked and did this several times, still over full. I haven't opened the power steering fluid yet. But, I did notice that I smell transmission fluid and I didn't have a dip stick. Once my transmission started slipping I park the truck. I just hate my back wasn't messed up and I could do my own work.