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03-20-2012, 10:57 PM
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#11
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Senior Member
Join Date: Jun 2008
Location: ORANGE COUNTY, CALIFORNIA
Posts: 482
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Re: Diff oil of choice
I was told when my 4X4 was done to use EDIT: SHOULD BE 85W-140 (NOT 75-140); fully synthetic to keep it running cooler and with no additives because I have air lockers.
Angel
__________________
2008 SMB E350 EB V10 White with Cruiser Top; EB-17 modified floor plan; Salem Kroger 4X4;
285/75/17E tires; Named: "The Lighthouse"
2000 Isuzu Rodeo V6 4WD
2006 Chalet LTW 15ft. Folding Travel Trailer 14 in. tires
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03-20-2012, 11:26 PM
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#12
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Senior Member
Join Date: Oct 2007
Location: SoCal
Posts: 1,071
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Re: Diff oil of choice
My understanding is that the Ford Limited Slip needs the Friction Modifier. YMMV
steve
__________________
'05 Ford V-10 4x4 SMB "50" White
'00 Jeep Cherokee 4x4 Highly Modified
'04 Jeep Grand Cherokee- wife won't let me modify it. :-(
Does anyone really read this stuff other than surfgeek?
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03-21-2012, 09:22 AM
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#13
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Senior Member
Join Date: May 2007
Location: Washington - Ridgefield
Posts: 4,728
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Re: Diff oil of choice
A locker doesn't need a friction modifier, a limited slip usually does. The factory Ford option is a limited slip, Angel has an aftermarket locker installed.
Mike
__________________
Alaska to Key West, Labrador and more
Prostate cancer survivor. See Thread Prostate cancer and Sportsmobiles
2015 VW GTI 2020 Fiat 124 Spider
2012 E250 Hitop camper
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03-21-2012, 11:48 AM
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#14
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Senior Member
Join Date: Dec 2011
Location: Washougal, Wa
Posts: 1,047
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Re: Diff oil of choice
Truetracs don't need a fricion modifier either. I think Angel has a truetrac in front and a locker in the rear. I'm running two truetracs. Or will be as soon as I get the drive shafts balanced on Friday 
__________________
John
Gnarvan 1992 E350 Clubwagon
Advanced 4WD Systems Conversion
Sotar Legend 12.5' X 22" Cataraft
2003 BMW R1150GS-Adventure
2013 BMW R1200GS-Adventure
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03-21-2012, 06:30 PM
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#15
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Senior Member
Join Date: Jul 2011
Location: Flagstaff, AZ
Posts: 2,001
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Re: Diff oil of choice
For kicks and giggles, I contacted Dynatrac and they don't recommend synthetics. They recommended Lucas 85w140 dino oil. I inquired about extra heat from towing and the tech suggested going to a finned aluminum rear diff cover.
The guys at the 4x4 shop in town also recommended Lucas Dino oil and believe synthetic has no place in differentials because synthetic gets thin when hot. They also didn't think highly of Royal purple.
go figure
__________________
2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun
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03-21-2012, 09:11 PM
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#16
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Senior Member
Join Date: Jun 2008
Location: ORANGE COUNTY, CALIFORNIA
Posts: 482
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Re: Diff oil of choice
Gnarvan, you are right about my SMB having TruTrac and ARB lockers.
ARB Air Locker Service guide recommends synthetic lubricant: Shell Spirax and Mobil Mobilube. The weight of oil depends on the outside temperature and type of use.
Angel
__________________
2008 SMB E350 EB V10 White with Cruiser Top; EB-17 modified floor plan; Salem Kroger 4X4;
285/75/17E tires; Named: "The Lighthouse"
2000 Isuzu Rodeo V6 4WD
2006 Chalet LTW 15ft. Folding Travel Trailer 14 in. tires
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03-26-2012, 02:14 PM
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#17
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Senior Member
Join Date: May 2011
Posts: 1,005
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Re: Diff oil of choice
Quote:
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Originally Posted by Angel
Gnarvan, you are right about my SMB having TruTrac and ARB lockers.
ARB Air Locker Service guide recommends synthetic lubricant: Shell Spirax and Mobil Mobilube. The weight of oil depends on the outside temperature and type of use.
Angel
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This is what I run in the Dana 60:
http://www.mag-hytec.com/oil-1605DUOLEC.htm
__________________
Sportsmobile-less.
"A job worth doing is worth doing at least twice."
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03-27-2012, 02:11 PM
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#18
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Senior Member
Join Date: Feb 2012
Location: Up In The Mountains
Posts: 427
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Re: Diff oil of choice
Amsoil sythetic extreme 75W-140 in mine also.
__________________
2003 Ford E-350SD 4x4
V10 / 4R100 / NV271
Front Axle - 1 Ton Spec Dana 60/King Pin/Open Knuckle/High Steer
Rear Axle - 1 Ton Spec Dana 60/Full Floating
Eaton E-Lockers Front And Rear/4:10 Gears
ARB Differential Covers - Nodular Iron With Dipstick And Drain Plug
Leaf Spring Suspension Front And Rear
46 Gal Transfer-Flow Fuel Tank
ExtremeAire Magnum Air Compressor
Reunel Rear Bumper
On And On ...
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03-27-2012, 02:52 PM
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#19
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Senior Member
Join Date: May 2011
Posts: 1,005
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Re: Diff oil of choice
Quote:
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Originally Posted by BIGVANS
Amsoil sythetic extreme 75W-140 in mine also.
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You guys need to say which diff you have, the Ford Sterling diff is different from the Dana 60 etc.
__________________
Sportsmobile-less.
"A job worth doing is worth doing at least twice."
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03-27-2012, 04:03 PM
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#20
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Senior Member
Join Date: Jul 2011
Location: Flagstaff, AZ
Posts: 2,001
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Re: Diff oil of choice
Having given this more thought and research I'm not convinced on the cost-benefit of synthetic in differentials. Dynatrac doesn't recommend synthetic in the Proroc60 and prefers to use a dyno lube similar to Torco or Lucas 85-140.
Add a friction modifier for a limited slip diff if needed. I'd rather take the cover off and change out the fluid every 20,000 or 25,000 miles. That's also the recommended interval for the Atlas transfer case. Is there anyone here that is willing to go 50,000 to 100,000 miles without changing the differentials? That's partly why synthetics are recommended. Same with Ford Coolant. Change at 100k.
You can find a quart of Lucas HD 85-140 online for $6.50 which is 1/3 the cost of the Purple stuff or Amsoil Extreme.
__________________
2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun
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