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Permatex RTV on rear differential

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Old 09-09-2019, 08:05 AM
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Originally Posted by BigTerp
Got everything done with no drama. Removed the cover, cleaned up inside the differential to get as much of the old gear oil out as possible. Then used a wire wheel to clean up both the housing and cover surfaces. Sealed back up easily with the Permatex RTV. I tightened down until I got some "squish" out of the RTV. Then torqued down after an hour. Refilled 24 hours later with Valvoline full synthetic 75W-140 and 4 ounces of Motorcraft friction modifier. No leaks so far.
75w-140 with friction modifier is recommended for older F150 limited slip differential. I guess that’s what you have.
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Old 09-09-2019, 08:20 AM
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Originally Posted by Nicklaus
75w-140 with friction modifier is recommended for older F150 limited slip differential. I guess that’s what you have.
What do you mean by Older ? this is an 04-08 thread ... we all use the same ..
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Old 09-09-2019, 08:28 AM
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Originally Posted by techrep
What do you mean by Older ? this is an 04-08 thread ... we all use the same ..
I did not notice that was a 04-08 thread...my iphone app only shows « maintenance shop » as thread label.
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Old 09-09-2019, 09:54 AM
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Originally Posted by Nicklaus
I did not notice that was a 04-08 thread...my iphone app only shows « maintenance shop » as thread label.
How much was that gasket and is it re-useable ?
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Old 09-09-2019, 09:59 AM
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Originally Posted by Nicklaus
75w-140 with friction modifier is recommended for older F150 limited slip differential. I guess that’s what you have.
Correct. It's an '04 XLT.
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Old 09-09-2019, 10:06 AM
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Originally Posted by techrep
How much was that gasket and is it re-useable ?
Can’t recall the price (maybe around 50$), but one use only (according to Ford).
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Old 09-09-2019, 10:20 AM
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Originally Posted by Nicklaus
Can’t recall the price (maybe around 50$), but one use only (according to Ford).
Wow... no thank you.
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Old 09-09-2019, 10:24 AM
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Originally Posted by techrep
Wow... no thank you.
The advantages for me with this gasket are:

- no need to wait prior to add oil
- no old RTV sealant to scrape off

However, removing rust from diff and cover flange is still required to do.
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Old 09-09-2019, 10:29 AM
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If you buy the correct permatex ... theres no need to wait.. and I'll clean the old gasket material off while cleaning the rest of the pumpkin out.. no big deal. beats $50 for a gasket each time.
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Old 09-10-2019, 03:36 AM
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If you were to wipe a coating of grease or assembly lube on that gasket (so it doesn't stick and tear) I don't see why it wouldn't be reusable, but $50 is a hard pill to swallow. I think I'd rather buy the Permatex and take the wife out on a cheap date.
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