Changing front (and rear) diff fluid..
Thread Starter
Senior Member
Joined: Jul 2023
Posts: 253
Likes: 66
What size rear axle do you have, 9.75 or Super 8.8?
Super 8.8 is a 12 bolt like the 9.75 but has two notches/ indents on the right.
Check it, if it's a 9.75 there is probably a gasket installed.
Make sure all mating surfaces are clean, no old Silicone.
Ford sells a Silicone Sealant, TA-29. One hour dry time.
Permatex also sells a Silicone Sealant for Gear Oil, 81182. 24 hour dry time.
Changing the front diff fluid on your truck looks to be a mess with that hunk of metal under it. I would probably use a gasket on that. You should not smear the wet silicone as you put the cover on.
If you do Silicone the front you might want to get (2) 10 x 1.5 mm short stems to help guide the cover on. Then remove them after you hand tighten the other bolts and the install those two bolts.
Super 8.8 is a 12 bolt like the 9.75 but has two notches/ indents on the right.
Check it, if it's a 9.75 there is probably a gasket installed.
Make sure all mating surfaces are clean, no old Silicone.
Ford sells a Silicone Sealant, TA-29. One hour dry time.
Permatex also sells a Silicone Sealant for Gear Oil, 81182. 24 hour dry time.
Changing the front diff fluid on your truck looks to be a mess with that hunk of metal under it. I would probably use a gasket on that. You should not smear the wet silicone as you put the cover on.
If you do Silicone the front you might want to get (2) 10 x 1.5 mm short stems to help guide the cover on. Then remove them after you hand tighten the other bolts and the install those two bolts.
Thread Starter
Senior Member
Joined: Jul 2023
Posts: 253
Likes: 66
Thread Starter
Senior Member
Joined: Jul 2023
Posts: 253
Likes: 66
i think it became more accessible after the lift. they installed a new crossmember and some other things got rearranged. i could be wrong though, because i don't recall what it looked like stock under there
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From: Somewhere on the south side of Heaven.
Put a hose on the suck side and stick it in there.
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Joined: Aug 2023
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For real that pump will leave you cussing and wiping up gear oil. Those suck horribly even when screwed atop the bottle. Ive probably bought 3 of them and they always leave stinky gear oil all over. Everywhere but where i want it.