My Super A had a very loud gear lash noise in 4th gear. So loud that I was afraid it was going to come apart. I drained the trans. and dif. and the pans at the bottom. All the oil was tan with water. I refilled all with 80w-90 gear oil and it reduced the noise some but it was still to loud to suit me. So I decided to try 85w-140 gear oil. After changing to the 85w-140 and running the tractor on the road for a couple of miles the noise went almost completely away. There is still a slight noise but it made a huge difference. HTH Dave
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