Transmission fluid and gear oil question???
Atf is a form hydraulic oil, while diff juice is just a heavy weight oil.
Last edited by samson_420; Dec 17, 2007 at 10:00 PM.
Gear oil refers to a thicker weight oil used in the rear end and in manual trannys. In the old days it was mostly 90 weight. It's main function is to lubricate gears. It now comes in multi weights like 75-90 and many others and also synthetics. There is a wide range of opinions on the 'right' one to use but it is still basically a heavy gear lube oil. Depending upon the vehicle, special additives may be needed.
ATF or automatic transmision fluid is a much different thing. DO NOT CONFUSE THE TWO.
ATF is a hydraulic fluid like what runs power steering and other applications like the controls on heavy equipment. It's main function is not lubrication but to power a hydraulic pump and is designed for it's ability to resist compression in the pump. It also can be vehicle specific.
Please do not attempt to change these fluids until you are clear on the difference and know the proper kind to use in your vehicle. Because, as stated above, everything will go FUBAR on you. (fu*ked beyond all repair).



