My 65 GMC was steering hard and a good friend told me he uses Justin Brothers Friction modifier in his and it really helped. So I tried it, just a little to top it off and after a week you could palm the wheel, really smooth and easy. You don't more than a couple of ounces because it is thin. We pull Mini Hot Rod Tractors and the rear end was getting to hot and the gear set only lasted about 4 outings. After a new set of gears I used about 1 pint in the rear and it dropped the temp by 25 degrees and the gears lasted the rest of the year and all of last year. Lucas oil probally has the same product, it gets used in a lot of auto trans.
