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Jan 14, 2006 | 11:23 PM

Smith76

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ford 9"

What is the best way to change the oil in a 9"? I dont think there is a drain plug anywhere. What is the best oil to use?

Jan 14, 2006 | 11:31 PM

ford390gashog

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From: Brentwood,CA

you need a suction gun. then just refill with a 75w140 gl4 or gl5 oil. i picked up a gallon for 7.00 you will need 3.5 quarts.

Jan 15, 2006 | 12:26 AM

76 F-150 390FE

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From: the side of a mountain

you could also pull the axles out a little bit undo the 3rd member and pull it back some and let it drain. dont try to pull it off by your self (atleast use a jack) as it is heavy as crap. clean the mating surface and use RTV and bolt everything back up.

Jan 15, 2006 | 12:28 AM

ford390gashog

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if you are going to do all that work might as well just pull the entire third member and install a new gasket. the third member is only about 70 lbs.

Jan 15, 2006 | 12:35 AM

76 F-150 390FE

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70 lbs still aint fun to be messin with under a truck, plus if you do pull it u can check it for wear in it.

Jan 15, 2006 | 12:40 AM

ford390gashog

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no its not fun but doable. i also replaced the leaking pinion seal while i was doing it. you can also add a drain plug like i did. i drill a 3/8'' hole on the bottom and welded a 1/2'' nut over it and used a stubby bolt inside of it. it works well and i just sealed it with teflon tape.