Trans & Diff Fluid Recommendation

[NoXiDe]

continue discussion below

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[JAJ]

The Tremec TR3160 in the GT350 is not an MT82. It takes Motorcraft XT-10-QLVC (Mercon LV) automatic transmission fluid as lubricant. The diff takes XY-75w85QL diff lube with XL-3 friction modifier. They are two very different fluids.

I change mine once a year after track day season is over.

 

[NoXiDe]

You've used Motorcraft XT-10-QLVC (Mercon LV) several exchanges already? Where do you purchase yours? I'm in rockauto and the search doesn't come up for the GT350. It does appear in the mustang category but typically if it used in the 350 it would be listed.

 

[JAJ]

You've used Motorcraft XT-10-QLVC (Mercon LV) several exchanges already? Where do you purchase yours? I'm in rockauto and the search doesn't come up for the GT350. It does appear in the mustang category but typically if it used in the 350 it would be listed.

The GT350 Owner's Supplement lists XT-10-QLVC as the trans lube. I actually use XT-11-QDC in mine, but that's because I'm bending the rules. QDC shifts better and runs cooler than the LV ATF that's spec'd. I get all my fluids from the dealer's parts department. That way I know it's genuine and the pricing is actually quite competitive. That said, ATF is way cheaper than QDC.

 

[honeybadger]

I've used the OEM stuff @JAJ mentioned in both, as well Royal Purple and Amsoil.

Royal Purple gear oil seems to be about on par with motorcraft - adequate, but not stellar. The Amsoil 75w-140 severe gear I just pulled out did very well in 100* degree heat with slicks. I'm impressed.

On my second batch of Amsoil Manual transmission oil and less impressed with it. Runs a bit cooler and shifts a bit smoother when hot than OEM, but a tad notichier than the Royal Purple synchromesh I used before.

Will try BG next to see how that works out. I change both diff and trans oil every few track days to keep it fresh.

 

[TDC]

Factory fluids since new for me using the Motorcraft P/N’s listed in the posts above.

As for Rockauto website, best results come from when you add the Motorcraft P/N exactly as it appears. The website sucks IMO but has the best prices.

 

[petstang]

BG fluids here and always happy with the performance.

 

[galaxy]

@honeybadger didn't you try a couple different Amsoil tranny fluids; the LV auto fluid and something else? I believe you liked one better than the other but can’t find where you mentioned that.

 

[NoXiDe]

There's been a lot of discussion on this so I appreciate everyone's input. Does anyone know the capacity and how many bottles of tran and diff fluid wlil be needed?

13.33 quarts for the tran?
2 quarts for the diff (SAE 75W-85 SYN + 1 full bottle (4oz) Addictive Friction Modifier + teflon tape for oem plug to tighten down (tools needed 3/8 drive, creston wretch)<- can someone confirm this is accurate? a video i watched showed 1.8 L was captured when measured.

Thanks ahead

 

[TDC]

Page 44, 45 I. The owners supplement. Link is below:

http://www.fordservicecontent.com/F...350-Supplement-version-1_su_EN-US_04_2016.pdf

Don’t overfill rear diff otherwise your vent tube will spew diff fluid on your rear suspension and tire (guess how I know

 

[NoXiDe]

Based on the data that I found,
2015-2016 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_su_EN-US_07_2015.pdf
2017 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_su_EN-US_04_2016.pdf
2019 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_sg_EN-US_12_2018.pdf

All models = Transmission Fluid: 2.5 quarts (2.4L):
To order: Motorcraft Mercon LV Automatic Transmission Fluid | https://www.rockauto.com/en/parts/motorcraft,XT10QLVC,transmission+fluid,11387 QTY 3

2016 Tech Pack / No Differential Cooler requires: 53.97 oz total of Rear axle fluid (1.5L) & Rear axle friction modifier (3.25 fl oz)
To order: Motorcraft SAE 75W85 Premium Synthetic Hypoid Gear Lubricant (Rear Axle fluid) https://www.rockauto.com/en/parts/motorcraft,XY75W85QL,gear+oil,11394 QTY 2
To order: Motorcraft Addictive Friction Modifier | https://www.rockauto.com/en/partsearch/?partnum=XL3 QTY 1

2016 Track - 2019
With Differential Cooler requires: 68.4966 oz total of Rear axle fluid (1.9L) & Rear axle friction modifier (4.23 fl oz)
To order: Motorcraft SAE 75W85 Premium Synthetic Hypoid Gear Lubricant (Rear Axle fluid) https://www.rockauto.com/en/parts/motorcraft,XY75W85QL,gear+oil,11394 QTY 2
To order: Motorcraft Addictive Friction Modifier | https://www.rockauto.com/en/partsearch/?partnum=XL3 QTY 2

Does anyone know why 2019 differential required .02 fl oz less than the 2016-2018 models? Did they just decide it was a good idea to include a little less? Typo? Figured I'd ask.

 

[TheDeadCow]

OP, what year & package do you have? 2016 tech packs didn't have tranny or diff coolers and would require less fluids.

If you have a '16 track pack or 17+

Get 3liters of tranny fluid & 2liters of diff fluid. Both systems hold more fluid but it is hard to drain each system entirely during maintenance.

Motul is the same price as Motorcraft (OEM)

https://www.motul.com/us/en-US/products/atf-vi

https://www.motul.com/us/en-US/products/gear-300-ls-75w90

Below is a link to the GT350 supplement manual, pages 48-51 define the fluid & quantities for the diff & tranny
http://www.fordservicecontent.com/F...350-Supplement-version-1_sg_EN-US_12_2018.pdf

 

[NoXiDe]

OP, what year & package do you have? 2016 tech packs didn't have tranny or diff coolers and would require less fluids.

If you have a '16 track pack or 17+

Get 3liters of tranny fluid & 2liters of diff fluid. Both systems hold more fluid but it is hard to drain each system entirely during maintenance.

Motul is the same price as Motorcraft (OEM)

https://www.motul.com/us/en-US/products/atf-vi

https://www.motul.com/us/en-US/products/gear-300-ls-75w90

Below is a link to the GT350 supplement manual, pages 48-51 define the fluid & quantities for the diff & tranny
http://www.fordservicecontent.com/F...350-Supplement-version-1_sg_EN-US_12_2018.pdf

Thanks for the response, I added more information earlier prior to your post. See above. Still, very great information you've shared so thank you.

 

[JAJ]

Based on the data that I found,
2015-2016 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_su_EN-US_07_2015.pdf
2017 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_su_EN-US_04_2016.pdf
2019 Supplement
http://www.fordservicecontent.com/F...350-Supplement-version-1_sg_EN-US_12_2018.pdf

All models = Transmission Fluid: 2.5 quarts (2.4L):
To order: Motorcraft Mercon LV Automatic Transmission Fluid | https://www.rockauto.com/en/parts/motorcraft,XT10QLVC,transmission+fluid,11387 QTY 3

2016 Tech Pack / No Differential Cooler requires: 53.97 oz total of Rear axle fluid (1.5L) & Rear axle friction modifier (3.25 fl oz)
To order: Motorcraft SAE 75W85 Premium Synthetic Hypoid Gear Lubricant (Rear Axle fluid) https://www.rockauto.com/en/parts/motorcraft,XY75W85QL,gear+oil,11394 QTY 2
To order: Motorcraft Addictive Friction Modifier | https://www.rockauto.com/en/partsearch/?partnum=XL3 QTY 1

2016 Track - 2019
With Differential Cooler requires: 68.4966 oz total of Rear axle fluid (1.9L) & Rear axle friction modifier (4.23 fl oz)
To order: Motorcraft SAE 75W85 Premium Synthetic Hypoid Gear Lubricant (Rear Axle fluid) https://www.rockauto.com/en/parts/motorcraft,XY75W85QL,gear+oil,11394 QTY 2
To order: Motorcraft Addictive Friction Modifier | https://www.rockauto.com/en/partsearch/?partnum=XL3 QTY 2

Does anyone know why 2019 differential required .02 fl oz less than the 2016-2018 models? Did they just decide it was a good idea to include a little less? Typo? Figured I'd ask.

The quantities in the manuals are a guide, but they're not definitive. What's definitive is in the Service Manual. First, when filling both the transmission and the diff, the car has to be level. Then, to fill the transmission, add fluid through the fill port until fluid starts to come back out of the fill port. On my 2016 track pack, that's about 2.7 quarts but it's not necessarily the same every time. For the differential, it's to be filled until there's fluid within 9mm of the bottom of the fill hole. On my car, when I drain it by unhooking the lower cooler fitting, it takes a total of 56 ounces of fluid, including the XL3, to fill it that far.

 

[SgdriskillGT]

Amsoil 75w-140 severe gear I just pulled out did very well in 100* degree heat with slicks. I'm impressed..

Does anybody worry about stressing the diff cooler pump with higher viscosity 7w-140 gear oil?

@honeybadger any problems with the pump?

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