How much gear oil goes in a 9'; inch Ford rear end?

It's out of a '70 Mustang Mach 1How much gear oil goes in a 9'; inch Ford rear end?
My manual calls for ';5 pints';, IE 2 and a half quarts. If you have traction-loc then call it 2 quarts plus a tube of friction modifier. If the rearend is new/rebuilt or getting a replacement differential it will hold 5 pints. If it is just having it's oil changed then almost a pint will still be in there, so 2 quarts.


1967 and earlier rears had filler plugs on the rear housing, later ones had them on the differential. Many times over the years has someone mated a ';late'; housing to an ';early'; differential and discovered they had no fill hole. And then there were lucky folks who swapped the other way around and ended up with two fill holes.


The old racer's trick to fill one of these was to jack up one side of the car, pull the axle and just pour the lube down the axle tube. Put the axle back in, etc, and you're good to go.How much gear oil goes in a 9'; inch Ford rear end?
Bartzan 4 is a Moron. Ford 9'; dont have covers. Report Abuse

just fill it up until if comes out of the fill hole. You cant over fill them.
if there is no hole, just get an aftermarket cover. They make some nice looking aluminum ones, and they have fill holes in them.
once you start to fill it and it starts oozing out of the fill hole,that's when you know.
The fill hole is on the front drivers side of the chunk. You'll need to use a 3/8 ratchet without a socket to get it out. If i recall, about two quarts will do it. You'll need to know what kind of differential you have, a limited slip will require lube made for it. Good luck.