I recently purchased a 4R75W from Monster Transmission with a shift kit. It was built beefed up and upgraded. I primarily use my F150, which is lifted and has off-road tires and all that good stuff for pulling my boat to and from the lake. It shifts great in the everyday traffic. It also shifts great pulling the boat and it's almost like it's not even like my boat is back there anymore. The customer support that I got from Monster Transmission was great and very informative on how things worked. How the core charge, shipping and returning the core works. It's just an overall great experience and I highly recommend Monster Transmission to anybody that's looking to get something to rebuild themselves or a new Transmission from them. I highly recommend Monster Transmission. Thank you.