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Gents, As most would know, primary and transmission on a sportster are lubricated with the same sump, same oil. Lubricant used must suit the clutch, primary chain, and gearbox. HD service manual says to use Formula+. I've done a search without getting information specific. What oil are you guys using in your ~2008 sporty transmissions, and why? I've just changed and put Spectro STL in and it seems noisy/clunky now. Maybe I've just gotten more sensitive because I changed it.
 

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75w90 gear lube
formula+
ford atf
20w50 oil
bacon grease...

all fine with varied chrateristics hen used... i've treid them all... i've settled on 75w90, mobil 1 or redline. either is fine by me. hd says formula+
 

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Any issues with fitting, e.g. interference, bolt diamters.?
the right needed to be spaced out about 1/4 inch to clear the belt guard. other than that, no sir.
 
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