Changing gear oil

Changing oils on bike, can't get my hands on Amsoil 75W-90 for the trans.What do you guys think on Valvoline SAE 80W-90 to heavy? or heavier the better for a bike? Thanks

It will be fine, the trans oil doesnt get as hot as engine oil. any good quality gear oil will be fine, Todd

I changed out the Syn 3 for Spectro.

Very happy with the shifting and finding neutral is easier.

Thanks for the reply guys.

Good afternoon all,
i have a 09 Fat Bob which calls for the formula + oil for the primary and transmission can i run anything else in it besides that or am i just screwed on buying it from yhe Harley Store

Some folks stick with the Moco stuff and are happy. See no need to change.

At the 1k mile service my dealer put Syn 3 in all three holes.

At 2k miles I changed to the Spectro in the trans and Amsoil in crankcase & primary.

I'm happy with the performance of both products and will use them in the future.

I've use the dyno from the factory 1st k, sny3 till 5k, formula+ till 15k and then belray 75-140 hypoid gear.

liked the formula+ and the belray a little better..

Amsoil synthetic 20/50 is used in all three. It is in the specs.

The Amsoil 20/50 is good for the engine, the 10/40 works a bit better in the primary, the lighter oil will have less clutch drag. Makes shifting a bit easier. Their 75/110 or 75/140 gear oil for the tranny. I like the 75/110. It handles the heat well enough, and in the cold it won't be as stiff as the heavier oil. If I rode in the real cold, like below 30 I might try the 75/90 or use the 20/50.

I run mobile syn. 20/50 in all three boxes. haven't had a problem shifts goog at all temp.
Tom

I use Amsoil 20/50 in the engine, 10/40 in the primary, and 75/90 in the transmission. Also run Amsoil fork oil in the front forks. If it takes oil it is Amsoil in our bikes and cars & trucks. Amsoil has a good fuel additive too.