RE: Why 75w90 in tranny?
If someone chooses to use 20w50 in the transmission....so be it, it is YOUR bike.
Gear lube with a GL-5 rating was originally designed for the Harley transmission. Brand, synthetic, non-synthetic, blend, or even grade is not a major concern here.
If I were to develop a major leak all of a sudden out in the middle of nowhere and no fix was viable. Gear lube was not to be found, but the bike still had to be ridden....then I would use just about any motor oil that was available at the time. I'll use a motor oil in an extreme circumstance in the transmission.
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1998 Electra Glide Ultra Classic EFI
1998 Electra Glide Classic
1998 FXDL Low Rider
1999 FXDS-CONV- SOLD http://www.hdtrader.com/56805
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