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Howdy, I am looking for some information about this transmission, specifically what type of oil is in the transmission case and where can I find a replacement for the upper oil seal? I have a GE WPSE4200A0WW top load washer. The was leaking water through the tub seal which lead to an unhappy transmission bearing. I came across this website that let me know that it was possible to work on this non-serviceable transmission: http://www.appliance-repair-it.com/GE-washer-is-leaking.html. I had a bear of a time getting the hub nut off and the basket off of the transmission. I got everything apart and the transmission out of the platform. I set it on its side and when I looked back at it, it was leaking oil out the top. The oil seal was not making a good seal around the splined shaft that drives the agitator. I can read the part number off of the oil seal as: MTP 4735, but I can not find much information about this seal. I measure the shaft to be 0.628"(though I imagine it is 0.625" unless its metric) and the bore to be 1" on the nose. The little I have learned by looking into oil seals shows how much I don't know about them! I lost most of the oil to the newspaper the transmission was laying on. Does anyone know the type and weight of the oil in this transmission? I found the plastic fill plug located on the top of the case. It would be great to not have to open the can of worms. Does anyone know if there is an oil seal on the bottom of the transmission? Thanks so much in advance for your time and help! There is also a lot of great information about working on this transmission on this site: http://appliancejunk.com/forums/index.php?topic=12091.0. Unfortunately fairbank56's pictures no longer load, as the other older posts say they were very helpful pics!