I wouldn"t want to be running hy-tran in a farmall A. Hy-tran is super expensive because it was designed to lubricate high torque gear trains while still being thin enough and having enough anti-foaming additives to work in high pressure hydraulic systems. Hytran isn"t necessarily better; just different. Gear lubricants are chosen based on the pitch-line velocity, surface finish, and the operating temps it is expected to run in. Slower speed gear trains with poorer surface finishes require a thicker oil, otherwise the lubricant will drip off the teeth before it ever reaches the mesh or the surface pits and peaks will be tall enough to "poke through" the oil film, wearing on the meshing gear (also called boundary layer lubrication). This isn"t a big deal for the later tractors (06 and up), as they have pressure lubrication supplementing the splash lubrication in the rear end with tubes to lubricate the rear end gears. Running hytran will result in a louder transmission that will have a tendency to coast forever until you can shift gears. Stick with 80-90 unless you put in ground gears and are planning to run road gear continuously. It won"t hurt anything unless you are doing 100% load pulling in first gear, but you will likely be happier with 80-90.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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