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For the same reason its bad to change weights of motor oil
If you use a 20w-50 it makes clearences larger because it is allot thicker and when going back to a lighter oil you will cause damage
This apply to your trans
I found this out the hard way after not believeing many of people that told me the same thing. I went to a 15w-50 (mobil 1) after years of gear oil and my pinion bearings failed with in 1000 miles not to happy about that
Hope this helps
Ben...............
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