Fluids - What to use???
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Senior User
Joined: Jul 2007
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From: Story City, Iowa
Fluids - What to use???
So I have heard conflicting info. on what oil to use in the engine, transmition, transfer case and front and rear ends. So what should I use?
If the weather holds for this weekend I am wanting to replace all the fluids in the truck. It's a 1974 F100 FE390 (from a '66 Mercury), C6 auto (original to the truck), NP205, 9" rear, and Dana 44 front.
So what weights is everyone using for these applications? Also quantitys of all so I can make one trip to the parts store. Is there any advantage to running synthetics everything?
Thanks in advance,
If the weather holds for this weekend I am wanting to replace all the fluids in the truck. It's a 1974 F100 FE390 (from a '66 Mercury), C6 auto (original to the truck), NP205, 9" rear, and Dana 44 front.
So what weights is everyone using for these applications? Also quantitys of all so I can make one trip to the parts store. Is there any advantage to running synthetics everything?
Thanks in advance,
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Senior User
Joined: Jul 2007
Posts: 403
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From: Story City, Iowa
I was running straight 30 wt in the old 360 that was in it. Leaked like a stuck pig with 10w30, so running 30 wt it slowed down to a slow leak. But it didn't like that heavy of oil in the winter at -20.
I guess my biggest issue is with the C6, transfer case and front and rear ends. I just don't want to have to replace something after I just got it all put back together.
I guess my biggest issue is with the C6, transfer case and front and rear ends. I just don't want to have to replace something after I just got it all put back together.
Elder User
Joined: Jan 2009
Posts: 741
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From: Western N.C.
C6- Use Dexron III or Mercon- 26.5 pints for 1974 4WD...don't forget a new filter!
T-fer case, F100 4WD- SAE140W gear oil- 1.25 pints
Dana 44-71F differential- SAE 90W gear oil- 4.75 pints
if limited slip, add friction additive EST-M2C1 18-A (add 4 oz. to rear, 2 oz. to front)
all Ford differentials- SAE 90W gear oil- 3300 & 3600-6.5 pints
3750- 7 pints
As far as engine oil, I run regular Valvoline 10W-40 in my 360.
Oil leaks? What oil leaks? That's just sweat from all those horses!!
T-fer case, F100 4WD- SAE140W gear oil- 1.25 pints
Dana 44-71F differential- SAE 90W gear oil- 4.75 pints
if limited slip, add friction additive EST-M2C1 18-A (add 4 oz. to rear, 2 oz. to front)
all Ford differentials- SAE 90W gear oil- 3300 & 3600-6.5 pints
3750- 7 pints
As far as engine oil, I run regular Valvoline 10W-40 in my 360.
Oil leaks? What oil leaks? That's just sweat from all those horses!!
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The first year Ford offered Mercon with a C6 (and C4's) was 1977.
Prior years used Type F.
Verbatum from the 1973/79 Ford Passenger Car & Light Truck Parts Catalogs:
XT-2QDX .. Automatic Transmission Fluid "MERCON" - for 1977/ Ford C6, C4 only.
More Turbo
Joined: Aug 2007
Posts: 555
Likes: 2
From: Washington state
So I have heard conflicting info. on what oil to use in the engine, transmition, transfer case and front and rear ends. So what should I use?
If the weather holds for this weekend I am wanting to replace all the fluids in the truck. It's a 1974 F100 FE390 (from a '66 Mercury), C6 auto (original to the truck), NP205, 9" rear, and Dana 44 front.
So what weights is everyone using for these applications? Also quantitys of all so I can make one trip to the parts store. Is there any advantage to running synthetics everything?
Thanks in advance,
If the weather holds for this weekend I am wanting to replace all the fluids in the truck. It's a 1974 F100 FE390 (from a '66 Mercury), C6 auto (original to the truck), NP205, 9" rear, and Dana 44 front.
So what weights is everyone using for these applications? Also quantitys of all so I can make one trip to the parts store. Is there any advantage to running synthetics everything?
Thanks in advance,
Just like my car 10W30 in the winterand 20W-50 summer.
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Elder User
Joined: Jan 2009
Posts: 741
Likes: 8
From: Western N.C.
OK...my fault...DexronIII/Mercon for the C6 is what it said in the book that I have at the house- it said that only the C4 uses Type F.
The good news is that now I have a real excuse to chuck it out. I've opened it three times since I've had it, and those three were only for minor things.
The 140W for the T-fer case was a typo...actually I think it said 10W40...or whatever you use in a manual trans...
Sorry for the mixup...I'll leave the numbers to the experts with the REAL manuals.
The good news is that now I have a real excuse to chuck it out. I've opened it three times since I've had it, and those three were only for minor things.
The 140W for the T-fer case was a typo...actually I think it said 10W40...or whatever you use in a manual trans...
Sorry for the mixup...I'll leave the numbers to the experts with the REAL manuals.
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Elder User
Joined: Jan 2009
Posts: 741
Likes: 8
From: Western N.C.
Question, though...if you get a rebuilt pre-77 C4 or C6, would you then use DexronIII/Mercon, or would you still have to use Type F?
I'm guessing it has to do with the band material, right?
_______________________________________________
One more life lesson learned...a twenty dollar manual can cause thousand dollar problems, especially in the hands of a trusting person!
I'm guessing it has to do with the band material, right?
_______________________________________________
One more life lesson learned...a twenty dollar manual can cause thousand dollar problems, especially in the hands of a trusting person!
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