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Old 06-14-2012, 09:51 AM
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What kind of diff oil?

Im going to change the front diff fluid and want to switch to synthetic. What is the best fluid and what wait? Do I need friction modifier like in the rear? I also want to do the same to my 7.3 and the transfer case in that. Same question for that.
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Old 06-14-2012, 03:47 PM
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.......bump.....
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Old 06-14-2012, 05:37 PM
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Unless your front differential is a clutch type posi, no friction modifier is needed. The friction modifier is for said clutches. That goes for the front OR the rear axle. The transfer case is most likely some form of ATF. As a rule of thumb, aluminum transfer cases take ATF, iron (old NP 205/203) take gear lube.

You should be able to cross reference temperature with weight of gear oil. As for the transfer case, I would either have the parts monkey at Circle K auto parts look it up, or ask the parts/service department at your local dealership. Either way, it's going to be ATF.
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Old 06-14-2012, 07:01 PM
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The current diff oil is 75w140 synthetic and available at any Ford dealer. No posi additive ever goes into a factory front difff because the factory has never offered a posi in the front axle. It is unsafe in loose traction conditions only the rear is it available. As far as the transfer case, use mercon 5 as it is a synthetic type oil. Also available at the Ford dealer.
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Old 06-15-2012, 07:28 AM
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Should be in the manual what to use. I seem to recall, though, that my manual states that the diff fluids are synthetic "lifetime" fluids and don't need to be changed unless you get water in there. I'll double check that.
I used Mobil 1 synthetic ATF in the t-case.
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Old 06-15-2012, 08:03 AM
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Quote:
Originally Posted by JIM_C View Post
Should be in the manual what to use. I seem to recall, though, that my manual states that the diff fluids are synthetic "lifetime" fluids and don't need to be changed unless you get water in there.
I believe this is Ford's recommendation. For me fluids are cheap and I change mine every 50K unless I go through some deep water.
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Old 06-15-2012, 08:09 AM
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The transfer case does not take mercon 5. If you buy a bottle of mercon 5, it says on the bottle "do not use in 4wd transfer case".

I believe the fluid for the transfer case is XL-10
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Old 06-15-2012, 10:43 AM
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Synthetic Oil

If you are still looking for the right oil, I would reccomend Amsoil. I like this stuff enough that I use it and sell it. I have their products in my F250 from head to toe. Drop me a line at iAlpha_T@yahoo.com if you'd like more information.
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Old 06-15-2012, 03:36 PM
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I would highly recommend amsoil. 75-140 is what ford uses in the rear and 80-90 up front. I've switched them both to 75-140 to just stock one oil. Amsoil also sells a great trans fluid that you can use in the transfer case. I run two 6.0's and have had great luck with it. And amsoil also sells the friction modifier that you need in the rear only. You can go to amsoil.com and on the right click on the light duty cars and trucks link and there will be hole break down of everything you need and the quantities you need. Helps take the guess work out of it.
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Old 06-15-2012, 07:06 PM
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Quote:
Originally Posted by EvansF250 View Post
Im going to change the front diff fluid and want to switch to synthetic. What is the best fluid and what wait? Do I need friction modifier like in the rear? I also want to do the same to my 7.3 and the transfer case in that. Same question for that.
Specs for 2005 6.0:

LUBRICANTS & FLUIDS:

Engine Oil
Grade 1......CI-4+
SAE 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil (AMEQT) SAE 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil (AMEQT)

Drain Interval Information
Synthetic 15W-40 Diesel Oil (DMEQT) Synthetic 15W-40 Diesel Oil (DMEQT)

Drain Interval Information
Synthetic 15W40 OE Diesel Oil (OEDQT) Synthetic 15W40 OE Diesel Oil (OEDQT)

-9 To 90 F......10W-30 [1]
-20 To 30 F......5W-30, 5W-40 [2]
-20 To 0 F......0W-30 [2]
above 10 F......15W-40 [3]
Manual Transmission,S6-650 (6-SPD)......MA
All TEMPS......
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Automatic Transmission,TorqShift......MSP
Low Viscosity Synthetic ATF (ATLQT)
Limited Slip Differential, Front......GL-5
All TEMPS......80W-90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Limited Slip Differential, Rear 10.5 RG......GL-5*
All TEMPS......75W-140 [4] [5]
SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT)
80W-140 Synthetic Long Life Gear Lube (FGO05)
Standard Differential, Rear 10.5 RG......GL-5
All TEMPS......75W-140 [4]
SEVERE GEAR 75W-140 Synthetic EP Lubricant (SVOQT)
80W-140 Synthetic Long Life Gear Lube (FGO05)
Transfer Case,......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)
Fluids
Brake Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
Clutch Fluid......
Clutch Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN)
Power Steering Fluid......MA
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Power Steering Fluid......MA
Torque-Drive Synthetic Transmission Fluid (ATD1G)

[1] Ford TSB 05-16-6 states that SAE 10W-30 is acceptable
to use in operating temperatures from -1 C (31 F) to
32 C (90 F).SAE 10W-30 is the preferred viscosity if the
operating varies from -20 C (-4 F) to -1 C (31 F).
[2] Ford TSB 05-16-6 states that the shown viscosity is
acceptable to use in the shown temperature range.
[3] Ford TSB 05-16-6 states that SAE 15W-40 is acceptable
to use in operating temperatures from -12 C (11 F) to
-1 C (31 F). SAE 15W-40 is the preferred viscosity if the
operating is above -1 C (31 F).
[4] Synthetic oil is required.
[5] Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or
equivalent formulated to meet Ford Spec EST-M2C118-A
for complete refill of limited slip axles.



FILTERS:
Oil Filter Absolute Efficiency Oil Filter (EA15K88)
Oil Filter AMSOIL Ford 6 L Oil Filter (SDF88) [1]
Oil Filter P550528 Oil Filter [1]
Air Filter P603577 Power Core Air Filter [2]
Air Filter P603577 Power Core Air Filter [3]
Air Filter WIX 49490 Air Filter [4]
Fuel Filter Fuel Filter for Ford 6.0L Diesel Powerstroke Applications (FFK60) [5]
Fuel Filter WIX 33899 Fuel Filter [5]
Transmission Filter WIX 58624 Auto Tran Filter [6]
Transmission Filter WIX 57702 Auto Tran Filter [7]

[1] Has No Lid Attached to Filter
[2] Standard Powercore Version
[3] Standard Powercore Version
[4] Replacement element for 24490 housing.
[5] Two Elements per box
[6] 5R110W
[7] Bypass Element

As far as "lifetime oil" no way. All oil breaks down eventually offering little or no protection. Check out this guide for recommendations and drain intervals http://www.amsoil.com/lit/g1490.pdf If you are considering AMSOIL I recommend becoming a preferred customer and purchase at wholesale not retail. It will save you $$$$$.
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