Transfer case fluid?? - Diesel Forum - TheDieselStop.com
6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties 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 6.0L Power Stroke engine.

 
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post #1 of 9 (permalink) Old 11-03-2018, 10:46 PM Thread Starter
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Question Transfer case fluid??

Time to change the fluid in my F250 4 X 4 Superduty transfer case. The book (still) says Mercon, some info says that MERCON has been updated to be MERCON V and then some sources say to use ONLY Motorcraft Transfer Case fluid. So what is the straight scoop? Hey, it only takes 2 quarts. I suppose I will go up to the Ford stealer---Uh, DEALER--- on Monday and ask. The trouble is I often think that those guys are either (or both) idiots or are just trying to sell me the "company line" and so tend to NOT believe them.

So...what do you all think?? I want to use the stuff that will give my truck the best chance to live a long, healthy life and to maybe help the "drive ability" along when I pick a fluid or part/upgrade or whatever.

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post #2 of 9 (permalink) Old 11-04-2018, 08:44 AM
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You are overthinking this. It is a transfer case that originally had Mercon ATF as a specified lubricant. Current Super Duty trucks use Motorcraft Mercon LV which is a superb choice for YOUR transfer case and is specified for use in ALL TRANSFER CASES superseding previous lubricants. In all reality, ANY high quality AFT would be fine. Yes, synthetic is fine as well.

MERCON LV Product Overview


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post #3 of 9 (permalink) Old 11-05-2018, 06:20 AM
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Your suppose to change that? How often?

2005 F-250 Harley Davidson edition:
Bullet proofed, usual mods.

2017 F-350 DRW Lariat Ultimate:
Stock pending warranty.
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post #4 of 9 (permalink) Old 11-05-2018, 02:25 PM
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Every 60,000 miles. Most guys do it twice as often.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM

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post #5 of 9 (permalink) Old 11-06-2018, 05:39 AM
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Annnnda... most people NEVER do and without repercussion. Transfer case failures are quite rare from my vantage point and as a matter of fact I don't think I have ever seen one fail from a lubrication concern. Usually it's operator error, abuse or another mechanical malfunction in the driveline.


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Last edited by ford_doctor; 11-06-2018 at 05:44 AM.
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post #6 of 9 (permalink) Old 11-06-2018, 06:21 AM
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Never done mine, 177,000 miles

2005 F-250 Harley Davidson edition:
Bullet proofed, usual mods.

2017 F-350 DRW Lariat Ultimate:
Stock pending warranty.
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post #7 of 9 (permalink) Old 11-06-2018, 09:56 AM
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LOL, I have 225,000 on mine! I guess I should put on the to do list! Woops!

2006 F250 Lariat Supercrew, ESOF 4x4, 18" tires, FX 4, HD Alt., block heater, Integrated Trailer Brake Controller, Upfitters, power rear window, cab lights - delivered 10/25/05

Ford Remote Start; High idle mod; Timbren load levelers, Scangauge II, Blue Spring upgrade, Quick Start 200 amp large frame alternator, 2 batteries January 2010; GPCM replace October 2011; 2 EGR valves; EGR Cooler replaced 12/30/11; Performance Machine & Mfg. coolant filter added 1/2/12; Rotella T6 5W40 oil; turned rotors, replaced brake pads for 1st time 1/7/12 101K miles; GPCM, both subharnesses and all 8 glowplugs replaced 1/5/13 at 118,000 miles; 2 Ford batteries replaced under battery warranty twice, the latest 9/18/2015; FICM power supply board replaced with Dorman board 11/20/13. Coolant flushed and replaced with Prestone ELC 9/27/14. STC fitting 10/19/14; Dummy Plugs 11/8/14; Turbo rebuilt 11/29/14; cold side CAC tube and boots replaced with metal tube 1/24/15; replaced hot side boots 1/30/16.
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post #8 of 9 (permalink) Old 11-06-2018, 06:03 PM
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Well - there are definitely two types of truck owners out there. I drop and drain my transmission pan every third oil change. My neighbor didn't know the transmission had fluid in it. Change fluid in the diff every 50K. Neighbor has never done it (although, when I changed his pinion seal for him last month, his diff was completely dry...) Guess it's just one of those things. Of course, I tend to keep vehicles until they just won't go anymore. My 61 year old and 52 year old cars are still going strong as it this old truck.

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM

I wonder if clouds ever look down on us and say, "Hey, look - that one is shaped like an idiot!"
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post #9 of 9 (permalink) Old 11-07-2018, 06:46 PM
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I flush my transmission every 50k, and change filters on it every 100k, with flush. While I am under there Its no trouble, or significant expense, to drain the T-Case and refill it. So I have changed mine every 50K since I got it new in 02.

2002 F250 7.3L PSD, bought new now at 226K miles, 4R100 Auto, Crew Cab, Short Bed, ITP Regulated Fuel Return system, ITP head to head SS oil cross over, Hutch in tank mod
Harpoon de tank vent, DIESELSITE Dahl 100 Pre-Pump Fuel Filter, DIESELSITE Return Fuel Line Cooler, DIESELSITE Engine Coolant Filter, DIESELSITE Auxilliary Transmission Cooler, DIESELSITE Gage Package, Pyro, Trans & Boost, Extreme Diesel AD injectors, Ford AIS Air Filter System, BTM straight through muffler, Moog Ball Joints, Rancho Shocks, Rotella ELC Coolant ,Stock Engine Program
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