make sure you use like spectro or red line shock proof motorcycle gear lube in the tranny. SYN # ws WWWAAAAYYY too thin for use in a transmission. hd is haveing bearing problems & a-lot of us know its because they don't use a gear lube, they use syn 3. also its pink in color, so if you see a pink tint in the primary oil when you drain it, then you know the seal to the eng is leaking.
also red line has a 20x60 syn motorcycle oil. thats inportant when you get stuck in traffic. go to a JAGG oil cooler.

 

If you go Redline in the tranny, use Shockproof Heavy. SJ Ron