I have bought gl-1 oil for my Troy bilt transmission at Napa, last time I went the guy told me he couldn't find it in their system.. When I was at tractor supply yesterday I noticed a new gear oil that they didn't stock before at my local store. Planning to start using this since they're closer than Napa.
http://www.tractorsupply.com/tsc/product/traveller-ford-tractor-all-mineral-90-transmission-fluid-2-gal?cm_vc=-10005
http://www.tractorsupply.com/tsc/product/traveller-ford-tractor-all-mineral-90-transmission-fluid-2-gal?cm_vc=-10005