today i wanted to change the fluid in my rear pumkin.curious to see what the color looks like since to previous owner did'nt take any care of the vehicle.I used a coasta synthetic sae75w-90 gear oil.the fluid color of the fluid was darker than the transmission fluid.since it was my first time doing this i checked out the new fluid and compared it to the old.big defference.the only problem that i ran into was trying to find a small plastic container that i could use to squeeze into the whole.i would like to hear from anybody who has done this before.thanks.