Rear diff sealing question
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
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From: Connecticut
Rear diff sealing question
I went to ford today to pick up rear diff fluid, im changing out my rear diff cover for an aluminum one and fluids have 83000 on them. So he says when you put the rtv sealing on, you let it skin over then bolt it on and let it dry for 24 hours before putting fluid in it because the synthetic oil will eat through the rtv if you add it to soon. Thoughts? I read most guys were only doing a couple hours and then putting fluid in. This was one of their mechanics that I was talking to..And when adding the fm to the fluid should I start with a full bottle?4oz. And add more if needed..Thats what he recommended.
you can't fix stupid!
Joined: Mar 2008
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what i do is: tonight i would drain and clean the surfaces real good and then put the rtv on the cover and let sit for 15 minutes. then bolt the plate up to the rear diff and be done for the night. go out in the morning and fill her up. when i add the fm i just dump the whole tube in and then fill with diff fluid but i get the tube from autozone so i dont know how much is in the ford fm tube. i have had trouble in the past getting my f350 diff to seal up but when i waited to put in the fluid until atleast 12 or so hours later its been all good.....
Posting Guru
Joined: Sep 2005
Posts: 2,476
Likes: 2
From: Monroe Michigan
what i do is: tonight i would drain and clean the surfaces real good and then put the rtv on the cover and let sit for 15 minutes. then bolt the plate up to the rear diff and be done for the night. go out in the morning and fill her up. when i add the fm i just dump the whole tube in and then fill with diff fluid but i get the tube from autozone so i dont know how much is in the ford fm tube. i have had trouble in the past getting my f350 diff to seal up but when i waited to put in the fluid until atleast 12 or so hours later its been all good.....
I wished I would have waited atleast 12 hours to refill. instead of 1 hour, because now I see oil seeping along the bottom edge.
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
what i do is: tonight i would drain and clean the surfaces real good and then put the rtv on the cover and let sit for 15 minutes. then bolt the plate up to the rear diff and be done for the night. go out in the morning and fill her up. when i add the fm i just dump the whole tube in and then fill with diff fluid but i get the tube from autozone so i dont know how much is in the ford fm tube. i have had trouble in the past getting my f350 diff to seal up but when i waited to put in the fluid until atleast 12 or so hours later its been all good.....
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
First, make sure the fluid you have doesn't have the FM in it already. Mine did. If it doesn't, add 2oz. and test drive by making sharp left & right turns. If you hear chattering, add the last 2oz. You can add it through the VSS sensor on the top of the diff if you don't have enough room to add it through the regular fill hole.
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
First, make sure the fluid you have doesn't have the FM in it already. Mine did. If it doesn't, add 2oz. and test drive by making sharp left & right turns. If you hear chattering, add the last 2oz. You can add it through the VSS sensor on the top of the diff if you don't have enough room to add it through the regular fill hole.
Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
hey guys i dont have a limited slip diff, so if i were to change my fluid and the fluid i got has friction modifier in it will it hurt anything? i am thinking not. what do you all say?
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Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Nope -- it won't hurt a thing. The FM is for clutches in an LS diff. Since you don't have any, it doesn't matter (just like using it in the front diff).
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Posting Guru
Joined: Sep 2005
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From: Monroe Michigan
I didn't start to see signs of seeping for a couple of months later.
Elder User
Joined: May 2007
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From: South LA
SSSHhhhhhhhhhhh!!!!!!!! knock on wood.
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
To be on the safe side ill to the removing of the plate and fluids and resealing the evening before and refilling the next day just because I would hate to have to replace 80 bucks in fluids again. I dont use my truck when im sleeping so drying overnight is no big deal. Lol. Well sometimes when I dream I do!! Lol