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M Wireman: Use gear oil 90 or heavier. If this SA is new to you or not been used much in awhile, jack both sides individually and watch for movement between axle and final drive. As another guy suggested don't over look that 2nd gear idea. You could have chip off a tooth on the bottom shaft you can't readily see. Power train noises can be quite decieving, as they can follow the powertrain. A good way to find these is if you can securely block rear wheels, start the tractor, and with it in gear, go over it with a stethoscope. Another item that works well is a hardwood broom, hoe, etc. handle, sawed off on both ends. Hold one end to your ear and place other end on tractor, at different locations. Amazing what noises you can zero in on. I often do this with my tractors, and will pick up on noises you never hear under normal operation. Be sure to block the tractor well, and just use lower throttle speeds. Good idea to hook a chain to drawbar and around a big tree. If anything goes wrong with blocking, etc. tree will kill the engine.
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