What is the recommended transmission lube for Harley Davidson, both big twins and sportsters?

The best transmission lube for your  harley davidson is Amsoil

For the 883cc and 1200cc Sportster motorcycles:

AMSOIL Synthetic 20W-50 Motorcycle Oil is recommended for both the engine and transmission.

1340cc and 1450cc models,- 20W-50 Motorcycle Oil is recommended for the engine crankcase, Series 2000 75W-90 Gear Lube for the transmission and the 10W-40 Motorcycle Oil for the chaincase.

Harley does however have a secondary recommendation in which a single Screamin’ Eagle motor oil is used in all three areas.  In such applications, the AMSOIL Synthetic 20W-50 Motorcycle Oil would be the preffered product. Yep you read that right

Protect your transmission in your  harley davidson.
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