For the rear axle/differential, you'll want to use a UTF that meets or exceeds the Ford New Holland M2C134D specification, as that fluid serves multiple functions, including hydraulic fluid if it has a 3 point lift, plus gear lubrication for the differential and reduction gears and coolant for the inboard brakes, and you want something that has the correct additives so that it works well for all 3 functions.
If your transmission is the auto reversing torque converter trans, then you will want to use an M2C134D compliant UTF in there as well, but if you have a manual reverser or a straight manual transmission, then you can use gear oil or 134 compliant UTF.
If you have power steering, you should use 134 compliant UTF in there as well.
If your 545 has a loader with a front mounted pump and the reservoir for the loader in the frame of the loader, then any regular hydraulic fluid will work fine for that system, but you can run 134 compliant UTF in there as well.
Many folks use the 134 compliant UTF in everything except the engine crankcase as it makes it easier to only have to keep one kind of fluid on hand and you don't have to remember which one goes where.
EDIT: - SORRY. Meant to say IF the Case Hy-Trans says on the label that it meets or exceeds the 134 specification you should be fine with that in everything.
This post was edited by Sean in PA at 05:55:28 07/07/13.
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