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How much gear oil to fill everything ?

JWMcCrary

Contributor
Bronco Guru
Joined
Oct 14, 2004
Messages
5,001
Everything has been apart and worked on and needs to be filled. Trying to tally up how much gear oil I need, figured somebody here could make it easy for me. Need to fill the following:

Dana 44
9 inch
NP435
Dana 20 (x2)
 

SteveL

Huge chevy guy
Joined
Jun 24, 2001
Messages
11,609
Loc.
Hawthorne ca
If you have an old ford truck/bronco manual it should give the quantities. Then buy extra so you can top em off. Don't forget the additive if you have a ls in either diff.
 

sykanr0ng

Bronco Guru
Joined
Aug 11, 2014
Messages
5,363
The Dana 20 will use different oil than the Ford 9 inch or the Dana 44, the additives for the hypoid gears eat the soft metals in the Dana 20.
Usually 50 weight motor oil is used for the Dana 20.
 
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