Lots of posts on what gear oil to use in the pumpkin - can't find any on how much.
Will a quart do, or do I need to get the gallon size? (15 touring).
Maybe this is too basic- but I remember someone telling me to fill it until your finger tip gets oily when you stick it in and point it down towards the bottom of the pumpkin.
On my 1926, I fill it thru the filler plug and add until the oil is level with the bottom of the plug hole. Kind of an automatic setup. Make sure the car is level. One quart is more than enough.
Here's an earlier thread on the subject:
Here's some info from the Ford Dealer Data book 1923:
"Differential 1-1/4 lbs. grease."
In the Ford manual (1921) instructions were:
"Do not make the mistake of putting too much grease in the differential housing. The housing should not be more than one-third full."
1/2" Under plug. Bob
That 1/2" under the plug that Robert talks about will put the gear oil just touching the gear. Which is exactly just what it's supposed to do. If you read the manuals, of course....LOL
Which one of them, Bob?
Bud has a '15 Touring. They had the plug at the mid point of the pumpkin, causing a lot of overfilled rear axles. In the manual Ford wrote: "If a fluid grease is used the level should be approximately one and one-half inches below the oil hole."
Later on Ford lowered the plug to about the one third level, making overfilling less of a problem.
I always go 1/2" under plug and never had a problem,Bob
So I guess you're talking about the later more common rear axles with the lower filling plug?
Since the filler holes were in different places in some years, I don't think using that as a guide is a very good way to do it. 1-1/4 lbs (which equals 1-1/4 pints) is always right.
I would say a pint is enough. Maybe a pinch more if you think it needs it.