I saw yesterday that Harley is now selling quarts of gear oil for use in the primary and tranny. Like most gest oils, it's expensive. $20/qt. I'm glad to see this because many people already run gear oil in their tranny and this basically just validated the claim that it's a good alternative.
https://mstore.harley-davidson.com/store/heavy-synthetic-gear-oil
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https://mstore.harley-davidson.com/store/heavy-synthetic-gear-oil
Sent from my SM-G950U using Tapatalk