REAR DIFF service

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Xr4MerkurMike
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REAR DIFF service

Post by Xr4MerkurMike » Thu Oct 29, 2015 10:37 am

I'm going to do a rear diff service with a commercial vacuum machine where you suck it all out through the fill hole and refill. Do I have to use 75w90? I can get 75w140 for free would rather use that if I can. Thx for reply
1988 XR4Ti Mono white Auto trans, MerkurDepot Radiator, otherwise stock for now

ford.scorpio
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Re: REAR DIFF service

Post by ford.scorpio » Mon Nov 02, 2015 2:05 pm

If you are changing the fluid, why don't you simply pop the lid, clean any sludge that will remain on the bottom of your diff, reseal, let sit overnight and refill? It's like changing tranny fluid by only dropping your pan & changing filter only & refiling; leaves 1/3-1/2 contaminated fluid within your system....

75w90 has the same cold temp pour values as 75w140; 90 is recommended and 140 is for trucks/heavy hauling; protects the gears with thicker film. You have had 75/90 for the past 30 years; keep it the same and just get good synthetic.

I have had great experience with Amsoil products in all of my diffs.........

FYI, torx bit 50 is your friend......
A man meets another addict and says "oh yeah, I have a Merkur too!" and the other man says "no way!!!!! ............how many?"

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mhamilton
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Re: REAR DIFF service

Post by mhamilton » Tue Nov 03, 2015 8:07 am

Take off the rear plate, no gasket is required. Use a thin shmeer of RTV to insure a good seal. Don't forget to reinstall the top vent.
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ford.scorpio
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Re: REAR DIFF service

Post by ford.scorpio » Tue Nov 03, 2015 11:42 am

x2

in my earlier reference, I said reseal and let sit overnight....

Most guys go for red RTV for diff/valve covers, this summer, felpro released GREEN RTV; has same properties & is designed specifically for gear (aka diff) oil. Used it on my trucks and works well!

While snugly installing your cover, allowing the seal to cure overnight without any additional chemical reaction with gear oil & retightening to specs the next day will give you the best results & years of uninterrupted service.

Do it once, do it right and be done with it.....
A man meets another addict and says "oh yeah, I have a Merkur too!" and the other man says "no way!!!!! ............how many?"

John V
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Re: REAR DIFF service

Post by John V » Tue Nov 03, 2015 3:22 pm

Boys RTV is for caulking around the bathtub...
This is for sealing car type stuff that you don't want to leak but which you one day want to separate and clean easily
Image

Read intructions..THIN. this is the best stuff. Made under licence from Drie-Bond GHMB.

With this you can even repair missing hunks of gasket in a pinch (do several layers, assemble and bob's your uncle)
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Re: REAR DIFF service

Post by ford.scorpio » Tue Nov 03, 2015 5:04 pm

available at your local NAPA.......

http://www.amazon.com/Permatex-81182-Ge ... B0023GM2KK


Specially formulated to withstand the harsh gear oil environment found in differentials and transfer cases
Specialty silicone does not break down against gear oil friction modifiers
Seeks and seals leak paths that cut gaskets cannot
Tested to Original Equipment Manufacturer (OEM) specifications to ensure complete sealing power
Sensor safe, non-toxic, and non-flammable
A man meets another addict and says "oh yeah, I have a Merkur too!" and the other man says "no way!!!!! ............how many?"

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mhamilton
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Re: REAR DIFF service

Post by mhamilton » Tue Nov 03, 2015 6:37 pm

Try the gray stuff, it's delicious.
(It also is RTV, Boys).

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Re: REAR DIFF service

Post by RichBaker » Sat Nov 07, 2015 6:21 pm

Yamabond 4 non-hardening sealer, the ONLY way to go.....
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Re: REAR DIFF service

Post by jmanbball » Sat Nov 07, 2015 7:53 pm

This stuff is damn good too. I've heard its the same stuff as Yamabond and other similar sealants:
http://www.permatex.com/products-2/prod ... rey-detail

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