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So while waiting for the repair on the transmission I started looking at gear oil. I know that there are a lot of different ideas regarding brands used. To date allI have ever used is HD straight 60. A buddy of mine has an S&S 93 with a Baker 6 and he uses BelRay 85w/140. He rides his Pan hard (doesn't beat it up tho). He swears by it in his tranny. Other brands that I have looked at/ started reading about...Red Line Heavy Shock Proof, Amsoil 75/110, Spector 70/145 & Lucas 85w/140. I really like the idea of the higher number for the "hot" range, and since I am using all Andrews gears in it I figured it would be worth the money to use a decent gear oil.
The factory book was written while gear oil was available
- but the factory book tells you to use motor oil in what ever straight weight you use in the engine in the trans -
reason it has brass in it - hi gear bushing - 1/ 2 under the gear as well as the 3 /4 under the gear - and in the lid shifting parts - early 3rd gear also had a bushing
gear oil eats the brass and causes 3 times the normal wear - but you buddy having a evo trans can use gear oil as nothing is brass in it
we use this 25 years and we do an easy75 4 speed and 3 with reverse thrown in as well gear boxes a year
I have found on old Car engines oil consumption increases dramatically with full synthetic oil, wouldn't surprise me if the same thing happened on an old clunker Harley too. I checked the oil in one of my cars mid season, the PO had put royal purple in it prior to me buying it. I was down 10 liters out of 18 I thought it leaked out! At the time I wasn't able to run out and get more of what was in it and I had conventional 20W50 on hand. Some oil is better than no oil so in it went. I drove that car the rest of the season with no noticeable consumption and then changed the oil the following spring to a conventional oil and haven't had an issue.
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Transmission Gear Oil
