I got some GL-1 straight 90w gear oil from Napa the other day: http://www.napaonline.com/Catalog/C...-Oil-80w90-1-GAL/_/R-FHQ65201_0434862994 $13 for a gallon.

Agri Supply also has it: http://www.agrisupply.com/gear-oil-...medium=NaturalSS&utm_campaign=SSIDE/

As does Tractor Supply: http://www.tractorsupply.com/en/store/travellerreg%3B-ford-tractor-all-mineral-90-transmission-fluid-2-gal

Check your local farm supply stores and you'll probably find some.

Last edited by 66Submarine; 07/14/2014 8:20 PM.
Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)

Website I made for my crap:
http://www.66submarine.com