Have an older(mid 90's) Murry Riding Mower 14.5 HP 42 inch deck. It has an automatic transmission and everyone I have talked with to this point tells me that it is a sealed unit. I have found a fluid reservoir attached to either the drive axel or the transmission. They(the trani and drive axel) look like they could be one unit. My question, should anyone be able to help, is what kind of fluid does this auto trani take?