Oil capacity 9" differential?

[LeoZelig]

Guys, I need to change the oil in my differential, and I need to know how much oil to buy.

I've searched the forums, but can't seem to find this info... which is surprising - I can't be the first with this question. If I'm missing the answer, my apologies for asking it again.

Anyway, I hate to get into a job and not have enough, and I also hate buying way too much.

Does anyone have an idea of the capacity of the 9" differential on a 69 F100?

Thanks in advance!

[fordman]

chiltons says a ford 3300 or a nine inch is 6.5 pints.

[LeoZelig]

Ahhh, so a Ford 3300 IS a 9"... I see.

Well, that clears that up.

Hey, thanks Fordman for the quick answer.

I picked up some Lucas synthetic on the way home and I'm going to use my office's vacuum sucker oil change thingy tomorrow during lunch.

Have a good one.

[fordman]

well chiltons only had a 3300 or a dana listed. so i translated that to mean 9 inch.

[mrtleavitt]

Ford 9 inch rear end takes 3.25 quarts of 90 w according to the manual. 80-90w works just fine.

[1971ford]

don't you just fill it up until it overflows out of the little filler whole?

[mrtleavitt]

Ya, but it's always nice to know what to expect so you know when it's getting full.

[fordman]

you alos have to know how much to buy if you are completely changing the fluid.

[LeoZelig]

Exactly!

We used this suction tank thing that our mechanics at work have to remove the old oil. I didn't want to take the cover off or loose and deal with the whole gasket issue.

We sucked it dry, but it only took a couple of quarts of new... so I'm guessing we didn't get all the old oil out. I thought about trying again, but at that point I wouldn't have had enough left if we sucked out the new oil/old oil mix and wanted to fill it back up. So I'll go with it as-is for now. A mix with new and old is better than all old, I figure.

At some point in the not too distant future I'll have to fix the seeping pinion seal, and at that point I'll change it all out.

Thanks for y'all's help.