Hi, Jim Leh here in Chebooygan, Mi. I have a c141. 1979 automatic with Sundstrand transmission. I have searched everywhere ( including here), to find out how to drain the hydrostatic fluid. The unit operates perfectly, but when I got it the fluid level was very low(but clean) and it has a non wheelhorse non Napa filter on it. I want to replace both so I'm assured its proper. So, how do you drain the fluid? Thanks for the help. Jim