I've been using Red Line V-Twin transmission fluid in my '21 Freewheeler for about 6,000 miles and haven't seen any difference with the exception that I can actually see it on the dipstick.
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I agree 100%. That has always been my experience, as well.To me it’s never made a bit of difference what weight or brand I have use. What has made the most difference is the primary fluid and proper level. Even off by 1-2 ounces made a difference in shifting and finding neutral.