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redline 75W140 #5354605 02/19/20 03:50 PM
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mobilaltima Offline OP
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It's time to change the oil in the rear end of my 2012 F-150 work truck that I recently bought. Its currently sitting at 156, 530 miles and I'm not sure if the previous owner ever changed it. its a 2wd with the 3.7 V6. I,m trying to figure out if its limited slip or not, giving the local dealer my VIN was no help. Anyway, Im considering running Redline 75W140 and changing it every 50-100k miles. I picked up a 4 oz bottle of the Motorcraft XL-3 friction modifier, in the event that it is limited slip, I'll have it when I'm ready to change it.

Asssuming that the Redline already has the LS additive in it, will it hurt to add the XL-3? I plan on scraping off the factory silicone and using a Lube Locker gasket. It has a 10 bolt cover, would anyone know the torque spec? Would it be better to buy a gallon of Redline off Ebay or Amazon?


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: redline 75W140 [Re: mobilaltima] #5354615 02/19/20 03:59 PM
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You can get both rear tires in the air, turn one tire & watch the other.
If the other tire turns in the same direction as the one you're spinning, it's a limited slip unit, turns opposite, open diff.
At least that way you will know if you need a friction additive..........

Re: redline 75W140 [Re: mobilaltima] #5354620 02/19/20 04:03 PM
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A quick and dirty test is to rotate one rear wheel while in park (parking brake off) , and in the air. If the opposite wheel rotates the opposite direction, it's an open differential. If no rotation happens, it's a limited slip.

The exception to this test is the rare Torsen differential, which acts as an open differential until power is applied and both tires have traction, then it locks up. You don't have a Torsen.


People who count on their fingers should maintain a discreet silence.
Re: redline 75W140 [Re: mobilaltima] #5354632 02/19/20 04:12 PM
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cb_13 Offline
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Check the axle code on the vin tag. Ford uses a letter as the first digit on limited slip and a number as the first on open differentials. The only exception is L it is used for the electronic locking. So examples 86 would be a 3.73 open diff b6 a limited slip 3.73 diff and L6 for a 3.73 with an e locker.

Re: redline 75W140 [Re: mobilaltima] #5354673 02/19/20 04:49 PM
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Why so heavy on the gear oil? Just wondering.


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: redline 75W140 [Re: mobilaltima] #5354713 02/19/20 05:49 PM
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mobilaltima Offline OP
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My axle code is 26, so it appears I have a Dana 60, 3.55 gears, open differential. I'm not complaining, no limited slip additive to worry about.

ls1mike, 75W140 is the spec'd fluid for my truck and most F-150s for quite a few years. I'd like to know as to why they use 75W140, versus most GM 1500, 2500 and 3500s calling for 75W90.


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: redline 75W140 [Re: ls1mike] #5354714 02/19/20 05:51 PM
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Originally Posted by ls1mike
Why so heavy on the gear oil? Just wondering.


OEM is 75w-140.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: redline 75W140 [Re: mobilaltima] #5354715 02/19/20 05:51 PM
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mobilaltima Offline OP
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cb_13 , thanks for reminding about the axle code on the VIN tag


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: redline 75W140 [Re: mobilaltima] #5354720 02/19/20 05:53 PM
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ls1mike Offline
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That was why I wondered. I have a 3500hd. Interesting. Not sure why the difference. Thanks!


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: redline 75W140 [Re: mobilaltima] #5354787 02/19/20 07:16 PM
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benjy Offline
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looking at the dana web site when i changed my frontiers drivetrain lubes shows they recommend a real synthetic 75-90 which redline is! the cheap OE Nissan lube is a 75-140 semi-syn for the nissan-dana 60 in it so i opted for the redline 75-90 + it requires NO xtra additives that could upset their chemistry. using all redline lubes netted me about 4 mpgs! my 6 spd manual 4.0 4 WD 2011 fronty king cab was averaging 19 mpg when i checked in the summer, VERY pleased!!

Re: redline 75W140 [Re: benjy] #5354805 02/19/20 07:33 PM
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Rand Offline
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Originally Posted by benjy
using all redline lubes netted me about 4 mpgs!


uh what? if that was true redline would have been bought by a car manufacturer and it would be an OEM fluid. Auto manufacturers spend billions searching for a mpg. I am a redline fan but that is physics defying.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: redline 75W140 [Re: mobilaltima] #5355158 02/20/20 08:01 AM
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Originally Posted by mobilaltima
My axle code is 26, so it appears I have a Dana 60, 3.55 gears, open differential. I'm not complaining, no limited slip additive to worry about.

ls1mike, 75W140 is the spec'd fluid for my truck and most F-150s for quite a few years. I'd like to know as to why they use 75W140, versus most GM 1500, 2500 and 3500s calling for 75W90.


75w140 is supposed to hold up better for towing. I know in my Jeep's owner's manual it says to use 75w140 in the Dana 44 rear axle when towing, and have seen that recommendation in other owner's manuals also.

I use Redline in the diffs of all the vehicles I service. The last time I did a diff fluid change on a friend's vehicle I used Redline in previously, the Redline had been in there for 50k miles and looked brand new. I actually wished I had left it in there.


1998 Jeep Wrangler Sahara 4.0L/5MT (156k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (60k) - Liqui Moly 5w40, MANN HU816X
Re: redline 75W140 [Re: mobilaltima] #5355310 02/20/20 10:44 AM
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mobilaltima Offline OP
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my mistake I dont have a Dana 60, its a Ford 8.8 rear. Would anyone have the torque specs for the diff cover? I'm getting various answers of 25 ft lbs, 33 ft lbs, and 28-38 ft lbs.


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
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