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Re: 75w140 Differential [Re: krismoriah72] #5134444 06/14/19 08:21 PM
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Slick17601 Offline
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Originally Posted by krismoriah72
Just curious why this truck needs 75w140 not 75w90?



Truck calls for 75W-140 in the manual.


2018 RAM Bighorn 5.7
2008 Toyota Sienna 3.5
Re: 75w140 Differential [Re: GumbyJarvis] #5134862 06/15/19 10:45 AM
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BoiseRob Offline
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Schaeffer's makes a 75w140 in quarts. Follow the link:

https://www.schaefferoil.com/170-gear-lube.html


2007 Chevrolet Silverado 2500HD LBZ Duramax
2016 Jeep Grand Cherokee Ecodiesel
Re: 75w140 Differential [Re: GumbyJarvis] #5137410 06/18/19 10:03 AM
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1978elcamino Offline
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So would it be safe to assume in Florida using a 75w140 in my f150 that tows a lot would be a good viscosity choice when it comes time?


2018 F150 5.0
2016 Ford Fusion 2.5
Re: 75w140 Differential [Re: GumbyJarvis] #5137424 06/18/19 10:17 AM
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Diesel12 Offline
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+1 for Schaeffers! Amazing lubricants thumbsup

Last edited by Diesel12; 06/18/19 10:17 AM.

1998 Dodge Neon-Rebuilt 2.4L-Schaeffer 10w-30
2014 Dodge Durango 3.6, 66K- Schaeffer 10w-30
2002 Ram 2500 Cummins 125K- Schaeffer 5w-40
2008 Dodge Avenger 232K Schaeffer 10w-30
Re: 75w140 Differential [Re: 1978elcamino] #5138266 06/19/19 07:52 AM
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zrxkawboy Online Content
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Originally Posted by 1978elcamino
So would it be safe to assume in Florida using a 75w140 in my f150 that tows a lot would be a good viscosity choice when it comes time?


I would say so, yes.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: 75w140 Differential [Re: GumbyJarvis] #5138409 06/19/19 11:51 AM
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GumbyJarvis Offline OP
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I settled on the Valvoline. I also ordered the Mopar Limited Slip Additive.

Since the valvoline already has a limited slip additive, how much would yall add of the mopar additive? I'm guessing around 2oz, but what say yall?

Re: 75w140 Differential [Re: GumbyJarvis] #5138639 06/19/19 04:45 PM
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BrianF Offline
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When I did the 9.25 in my now sold 2011 1500, I used a group 4 based 80w140 that already had the LS additive in there. As test, I added a few oz bottle of GM LS additive. What I found was poorer lockup under load. Unloaded, you could not tell when it engaged but under load with a trailer, the LSD could not lock up.

My second fill with the same fluid, I skipped the extra additive. Unloaded was no discernable difference but it would not engage under heavy load.

So my opinion is don't add any additive. Just add the fluid, put on some miles and see how the engagement is.


2006 Trailblazer LT. QSUD, Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30, Baldwin BT7349.
1993 GMC 1500. QSAD, Fram PH5
Re: 75w140 Differential [Re: GumbyJarvis] #5139451 06/20/19 04:56 PM
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DGXR Offline
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By everything I have seen, the fluids with the LS additive work just fine on most vehicles that call for LS. If you use it and feel/hear chattering or stuttering, then add 4oz of the LS fluid. Personally I use Amsoil severe gear 75w90 in my Corvette and Tacoma differentials, it is great stuff. I do see 100F regularly in summer but I'm not towing or hammering the gas all the time. Valvoline is good, as is Mobil, as is virtually any other name brand synthetic gear oil. I am also curious why 75w140 is spec'd and not 75w90.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
2003 Honda XR400R
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