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Tranny Lube

Chris deHahn writes:

"My experience with gear lubes is limited to the testing I did with my stroker. It was not a lab test, it was an application test. It proved to me, beyond a shadow of a doubt, that the type of gear lube used in a Harley-Davidson transmission has a profound affect on it's performance.

HD semi synthetic -- good all around, got sloppy when hot
Golden Spectro 80W -- too thin, shifted poorly throughout heat range
Bel-Ray 90W -- much better, but not as good when hot
Bel-Ray 80W-140 -- as good as it gets, shifts quick and clean cold or hot

This was a Big Twin four speed tranny with Andrews CR gears, clutches, shafts, and forks, with a ~110hp Shovelhead stroker motor driving it."