Jim, keep in mind that "rear end fluid" can also be front axle fluid, and of course is "everything else fluid" too. Hydrostatic transmission if you have one, fluid for the 3pt, the loader if you have one, and the power steering too. Mobilfluid 424 is good, I used if for a number of years, but I have switched to the Kubota SUDT II. It is slightly better in cold weather and is a premium (premium price too) fluid.