Changing rear diff fluid...no friction mod needed with Mobil 1??

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,248

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Massachusetts

Oct 21, 2007

#1

• Oct 21, 2007

• #1

I just finished replacing a leaking axle seal and am about to fill the rear end back up.


Since it's sunday, i can't get friction mod from Ford

However, i bought 2 quarts of Mobil 1 synthetic ($16 each) and it states that it already has the additive included.

So i can safely add it and not worry about the ford friction mod correct?

Just wanted to make sure before i started driving around.

I'm gonna go return the tools i needed for the axle seal and look for a pump and then tackle the fill

 

03ghoststang

Well-Known Member

Jul 16, 2005

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Los Angeles, California

Oct 21, 2007

#2

• Oct 21, 2007

• #2

if it says that it has modifier included then your good to go........thats why i use royal purple already comes with it

 

S

Scorcher2005

Member

Apr 17, 2004

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South Carolina

Oct 21, 2007

#3

• Oct 21, 2007

• #3

Where did you find the Mobil 1? I look everywhere and cant find syn gear oil.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,248

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Oct 21, 2007

#4

• Oct 21, 2007

• #4

Autozone has it.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,248

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Massachusetts

Oct 21, 2007

#5

• Oct 21, 2007

• #5

So i filled up my diff. I had the car on ramps so i went to the fill hole instead of slighly below it.

Should i go back and top it off after a few days? Won't the fluid flow into the axle tubes and the level slightly drop? Something i should be concerned with or not?

I only got about 1.5 quarts in before it came out of the hole.

 

N

Nightstick

New Member

Jul 1, 2007

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Oct 21, 2007

#6

• Oct 21, 2007

• #6

I got Mobil 1 75W140 diff. fluid at Advance autoparts.

No extra modifier needed.

It should hold about 2 1/2 quarts if you took the diff cover off.

 

blackfang

Founding Member

Dec 17, 2001

1,290

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39

Richmond, Va

Oct 21, 2007

#7

• Oct 21, 2007

• #7

When I installed my girdle I went with Mobil 1 being napa was out of Royal Purple(which is whats in the trans and engine).

 

SVT32VDOHC

waiting for the next hack atta

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Nov 22, 2001

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119

Motor City

Oct 22, 2007

#8

• Oct 22, 2007

• #8

Last time I changed diff fluid I swear it took just under 3 quarts. I got two full bottles in there and then the 3 one it started leaking out. Over filling it is just as bad as under filling it.

 

Bad92GT

The 5 Minute Plan Man

Jun 10, 2004

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SC

Oct 22, 2007

#9

• Oct 22, 2007

• #9

i put friction modifier in it with it.. is that bad 0.o

 

Tally_4.6

Member

Feb 26, 2006

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Orlando

Oct 22, 2007

#10

• Oct 22, 2007

• #10

If you weren't on level ground when you filled it, it will be low when its back on level ground.

 

larrendeuce

Member

Sep 13, 2003

649

1

19

Southern NJ

Oct 22, 2007

#11

• Oct 22, 2007

• #11

I was talking to a friend who was a ford tech. I asked him about the gear oil service interval since the owners manual says the axle is lubricated for life. He said its filled with ford synthetic gear lube and its like $30 a quart, and its much better then store bought lubes. 3 qts and 4 oz friction modifier.

 

BennyBlown2v

New Member

Dec 9, 2004

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Carmel, INdiana

Oct 23, 2007

#12

• Oct 23, 2007

• #12

Proper fill spec per ford service manual:

1.66-1.77-liters (3.5-3.75-pints)
6.4-14.3-mm (1/4-9/16-in) below the bottom of the fill hole

I ran the mobil 1 synth with no added friction modifier on my built solid axle, and my stock setup - it worked GREAT!

 

B

BannonJr

Member

Aug 12, 2006

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St.Lazare Quebec

Oct 23, 2007

#13

• Oct 23, 2007

• #13

I gotz 2 bottles of RP in mine...but looking at the post above...looks like I bettah top it up...eh.

 

Mustang5L5

That is…until I whipped out my Bissell

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Feb 18, 2001

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Oct 23, 2007

#14

• Oct 23, 2007

• #14

BannonJr said:

I gotz 2 bottles of RP in mine...but looking at the post above...looks like I bettah top it up...eh.

Click to expand...

1.77 liters is 1.87 quarts...so just under 2 bottles

 

R.J.

Member

Aug 20, 2003

813

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Warwick, Rhode Island

Oct 24, 2007

#15

• Oct 24, 2007

• #15

Yes the haynes manual also says 3.75 pints or just under two Qts. If you only got 1.5 Qts in then you are a little low.

 

S

steve_stang2003

New Member

Apr 18, 2007

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0

Oct 24, 2007

#16

• Oct 24, 2007

• #16

Mustang5L5 said:

I just finished replacing a leaking axle seal and am about to fill the rear end back up.


Since it's sunday, i can't get friction mod from Ford

However, i bought 2 quarts of Mobil 1 synthetic ($16 each) and it states that it already has the additive included.

So i can safely add it and not worry about the ford friction mod correct?

Just wanted to make sure before i started driving around.

I'm gonna go return the tools i needed for the axle seal and look for a pump and then tackle the fill

Click to expand...

I used Mobil 1 as well and if I recall it said something like "For Severe Applications additional friction modifier might be needed"

Check the fine print on the bottle.

I added a bottle of the Ford stuff anyway.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,248

17,929

224

Massachusetts

Oct 24, 2007

#17

• Oct 24, 2007

• #17

R.J. said:

Yes the haynes manual also says 3.75 pints or just under two Qts. If you only got 1.5 Qts in then you are a little low.

Click to expand...

Yeah, i'm going to go back under this weekend and top it off.