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It is a GL-5 spec. The Toyota service manual states GL-5/ hypoid oil. How is it possible for the GL-5 to eat the syncros right after the fill and test drive? It shifted hard right immediately and didn't change much when warm.


My truck has been doing the same thing. Butter smooth until I changed it with 75-90 synthetic. Now first and second gear give me issues.. especially first.. I can feel it grind sometimes and I have to wait till it's at a complete stop when cold. Once warmed up, it is fine..

I dont know why..