For those out there who became believers in the TORCO brand 75W140 gear oil like I did, I have some news. Couldn't get the stuff from my usual supplier, but I found that National Drivetrain, a 4X4 & offroad specialty firm, markets it under their own label. Can be purchased for $8.50 per quart, plus shipping, of course. Also available with or without limited slip additive. I've used swepco in the past. Believe me, your 915 gears will move much smoother & easier with the Torco synthetic stuff. On the national drivetrain label, a small portion says: "made by Torco", so it is the same stuff. National Drivetrain, 4336 Losee Road, #4, North Las Vegas, Nevada 89030. Local number is (702) 657-8307. Toll free: 1-888-770-4327. Anybody know of a source for the old TORCO brand? For some reason, my supply just dried up.