Redline primary fluid, Redline tranny fluid w/ shockproof and Amsoil 20w50 in engine. Both of my bikes use the same fluids. So far it works good for me....
I do have a buddy of mine that has an '04 Chopper and he runs Amsoil in all three holes and gets along fine. To all their own...
I use Amsoil 75w-90 severe gear in my Pitbull tranny. Been using it since I bought my Big Dog in 2009 and have had great results. No slipping or other issues. I run Amsoil in both my bikes and all of my vehicles too. Everybody that is into synthetics has there preference. I don't want to debate which is better. I have been an Amsoil fan for years and that is my preference. The main point as far as I'm concerned is that synthetics are worth the extra investment. They are superior to mineral based oils and I recommend them whole heartedly.
I know this thread is a bit old, but I found it useful- this link at Baker is really good on the topic of fluids for tranny / primary, and even talks about use of ATF