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For all the other types of gear oil...did you make sure that it was a GL-4 based oil instead of the GL-5 type? i know that royal purple is a GL-5 type and many other oils are as well and the polymers in GL-5 based is finer and would mess up synchros and other bearings..thats why both KA and SR trannys love GL-4 base! if you do happen to pull the trans apart, rock some redline MT-90 it made a huge difference with my trans from coming out of the regular 75W90 GL-4 base
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