Transfer case fluid change,differentials oil change - Page 2 - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #16 of 33 (permalink) Old 08-03-2010, 12:14 AM
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Royal Purple or Redline 75/140 for the rear( no friction additive needed)

75/90 for the front, either dino or synthetic

Mobil 1 for the transfer case

It doesn't get any easier.....

You can find all of them at the local auto parts...

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post #17 of 33 (permalink) Old 08-03-2010, 03:36 AM
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Originally Posted by SmokeyWren View Post
Kevin, read that again and you'll see it says "Do not use ... in transfer cases."
HMM, , you're right, Smokey, but Mobil 1 Synthetic ATF says on the bottle, "Also suitable for use in automatic transmissions for the following applications: .....Ford Mercon, Mercon V, Mercon LV...."
To me that means it's equivalent to Mercon, which was what Ford called for in my t-case as well as an automatic tranny for my year model.

I have a suspicion that Ford's "Transfer Case Fluid" may be the old Mercon, but that's just a guess. Maybe they rebottled their old Mercon stock and remarketed it. Ford doesn't say why not to use Mercon V in t-cases. I can't see what would make a t-case self destruct with Mercon V in it, as there aren't any synchronizers, friction clutches or similar things like you'd find in an auto tranny, just gears, bearings, and a chain.

I just put the question to Exxon Mobil thru their Mobil 1 website. We'll see what they say.

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post #18 of 33 (permalink) Old 08-10-2010, 08:26 PM
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Yes Kevin, please let us know what they say. I have had Mobil 1 ATF in my transfer case now for two years.

2001 F-350 Crew Cab XLT PSD 4x4, Long Bed, 6-speed, 3.73, Manual Transfer, Power TTT Mirrors, 122k miles.
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post #19 of 33 (permalink) Old 08-10-2010, 08:57 PM
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Not a peep from Exxon Mobil yet. I'll be sure and post their response when and if it arrives.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #20 of 33 (permalink) Old 08-10-2010, 09:28 PM
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Ive been running the mobile syn ATF for 7 years in my T-case. No problems. I change it once a year.

2002 Excursion 7.3L 200K+, After market tranny cooler, diesel site transmission filter kit, coolant filter kit and complete boot kit, bilstein shocks. Original transmission with mobile syn ATF
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post #21 of 33 (permalink) Old 11-22-2010, 02:03 PM
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Quote:
Originally Posted by SmokeyWren View Post
Transfer case: 2 quarts Motorcraft Transfer Case Fluid.

Rear axle: 6.9 pints 75w140 synthetic. Pay attention: that's SYNTHETIC gear lube.

Front axle: Your Owner's Guide calls for 3.8 pints 75w90 synthetic axle lube. The latest workshop manual published in 2003 for 2000 Excursion says SAE 90 Premium Rear Axle Lubricant.

The current quick reference chart for differential lube used by Ford techs is at:
Motorcraft quick reference chart for axle lubes

Since the quick reference chart is current, it may be different than old printed manuals from several years ago. I can't read upside down, so I've learned to print out the chart and then I can read it.

Transfer case lube changed a few years ago. Your Owner's Guide says to use MERCON, but MERCON is no longer available, and you cannot use MERCON V. So you have to use the new stuff Ford developed specifically for transfer cases - Mortorcraft Transfer Case fluid:
http://www.fcsdchemicalsandlubricant...oduct=Transfer Case Fluid&category=Transmission Fluid

Sorry to drag up an old post, the quick reference chart you linked shows my 02 F350 taking 75/90 synthetic rear axle lube, and my owners manual says it takes 75/90 premium 4 wheel drive lube. I just changed it with 80/90 rear axle lube, did I mess up?


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post #22 of 33 (permalink) Old 11-22-2010, 02:39 PM
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I just changed it with 80/90 rear axle lube, did I mess up?
That chart says your Dana 60 front axle in a 2002 needs SAE 75w90 synthetic rear axle lube. 2003-up Dana 60 front axles need 80w90 Premium rear axle lube (which I assume is dino and not synthetic). If the 80w90 you used is synthetic, then you're probably good tp go. But if it is dino juice, then I'd change it again and use the right stuff this time.




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post #23 of 33 (permalink) Old 11-22-2010, 06:26 PM
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Yes, I see the chart says that. I am confused as to why the chart says synthetic but my owners manual says "Premium". They contradict each other.


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post #24 of 33 (permalink) Old 11-22-2010, 08:27 PM
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I am confused as to why the chart says synthetic but my owners manual says "Premium". They contradict each other.
Yes, but your Owner's Guide is 9 years old. The chart on the website is dated 6/20/2010. Apparently Ford engineers learned something during those 9 years.



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post #25 of 33 (permalink) Old 11-22-2010, 08:31 PM
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Just changed it to synthetic 75/90. Thanks for your input.


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post #26 of 33 (permalink) Old 11-22-2010, 10:19 PM
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Speaking of wrong fluids for diffs, I was wondering about some of mine. For the sake of simplicity ive been changing all of my diffs with synthetic 75w140. thats 1 D50, a sterling, and a ford 8.8 in a car. The 8.8 gets the snot beat out of it and also havent added any friction modifier (a little chatter, but I prefer a firmer grab of the clutches) and havent had any problems at all in any of my axles.

Do any of you guys foresee any problems or should I take this post to pirate to get flamed there?

2000 F350 7.3l auto 4x4 CCLB Dually lariat, my new baby purchased 8-22-11
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post #27 of 33 (permalink) Old 07-11-2018, 03:04 PM
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Quote:
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Quote:
Originally Posted by bigb View Post
I am confused as to why the chart says synthetic but my owners manual says "Premium". They contradict each other.[IMG class=inlineimg]https://www.thedieselstop.com/forums/images/smilies/read.gif[/IMG]
Yes, but your Owner's Guide is 9 years old. The chart on the website is dated 6/20/2010. Apparently Ford engineers learned something during those 9 years.
So to ask in 2018....
What's best for the transfer case?
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post #28 of 33 (permalink) Old 07-11-2018, 03:32 PM
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Still synthetic atf.
Or just get the tcase stuff from ford.

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post #29 of 33 (permalink) Old 07-11-2018, 05:13 PM
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I just changed my tranny and t-case and used Mobil 1 Syn ATF (again). I'm at 215k miles, and run all winter with the hubs locked in, so my t-case gets abused a bit, turning all winter long whether in 4x4 or not, and it hasn't grenaded on me yet. I'm personally not worried about using a "non-approved" fluid.
But you could go by Ford's recommendation. They seem to change fluid specs as often as we change our underwear.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #30 of 33 (permalink) Old 07-11-2018, 09:40 PM
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Thx...
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