Harley troubleshooting just used synthetic harley in my tranny was told by harley no problems thought it was funny one oil all 3 fills first gear felt like it skipped taking off yesterday . should i use thicker or regular tranny fluid ????

SOURCE: how often should i change tranny fluid, 3000 mi,

If you're running Harley oil, you're running either semi-synthetic or full synthetic. You bike came with H-D Syn3 20W50 fully synthetic oil in the transmission. They use the Syn3 in the engine, transmission, and primary now. You can use whatever you like. Amsoil, Royal Purple, and Mobil make oils that are suitable for this use but you'll have to check their website to determine which one they recommend.

SOURCE: Chanmge from conventional 20W50 oil to synthetic

Not a problem, I've done it on my '94 model Wide Glide. Your bike probably came from the factory with synthetic oil in it. Harley developed their Syn3 20W50 oil and the bikes are shipped with the stuff in all three compartments, the engine, the primary, and the transmission. Just check the manufactures website to make sure whatever oil you decide to use meets Harley's specs.

Good Luck
Steve

Testimonial: "Thanks, but what about the oil in the cases?"

SOURCE: i have a 1979 shuvelhead

Personally, I use H-D oil for the engine and tranny. I use 60wt engine oil and the H-D semi-synthetic transmission oil. Now, there are many other brands of oil that you can use. Golden Spectro, Royal Purple, RevTech, Amsoil, Mobil, Motor Factory, and many others. You need to go to their websites to find out what is recommended. H-D oil is close to me and priced about the same as the others.

Good Luck
Steve