Tranny fluid question - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. 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 #1 of 8 (permalink) Old 03-13-2005, 01:07 PM Thread Starter
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Tranny fluid question

The guy who put in my shift kit told me that he used mercon V to fill it. That was months ago and I havent really seen any problems with it. I will change it back to the correct fluid when I change out to a different TC, still trying to figure that one out too. What would I see as a problem from this?

Thanks

Mark

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post #2 of 8 (permalink) Old 03-13-2005, 01:44 PM
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Re: Tranny fluid question

I've been told it is too slippery and makes the shift too soft by slipping. Our trannys are designed to shift under full power and by slipping the clutches, they will destroy themselves. Not good to use it and Ford says DO Not use Mercon V in our trucks. Ever!
Jim

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post #3 of 8 (permalink) Old 03-13-2005, 03:03 PM Thread Starter
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Re: Tranny fluid question

Ok so the only thing that is getting chewed up is the TC? No hard parts in the tranny? If so then when I replace the TC and fluid then I should be ok right?

Thanks

Mark

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post #4 of 8 (permalink) Old 03-13-2005, 03:18 PM
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Re: Tranny fluid question

[ QUOTE ]
Ok so the only thing that is getting chewed up is the TC? No hard parts in the tranny?

[/ QUOTE ]

No.

Where did you get that?

The tranny includes all sorts of clutches. Mercon V will wear out those tranny clutches 4 or 5 times faster than MERCON. So the tranny won't stop shifting immediately, but it will last only about 20 to 25 percent as long as it would if you had the right ATF in there.





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post #5 of 8 (permalink) Old 03-13-2005, 04:12 PM
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Re: Tranny fluid question

One 4R100 transmission I took a part a few years ago I found several of the clutch plates had fell apart, the friction material had fallen off the metal disc. [img]/ubbthreads/images/graemlins/eek.gif[/img] There were no codes in the PCM and the fluid was a little dirty but not burnt. I have no clue what fluid was in this transmission bit it think it was mercon V.
FMT
[img]/ubbthreads/images/graemlins/shrug.gif[/img]


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post #6 of 8 (permalink) Old 03-13-2005, 04:21 PM
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Re: Tranny fluid question

[ QUOTE ]
Ok so the only thing that is getting chewed up is the TC? No hard parts in the tranny? If so then when I replace the TC and fluid then I should be ok right?

Thanks

Mark

[/ QUOTE ]

From what I read, it's more complicated than that and I never could for good reason get exactly what would happen as far as failure modes or how long it would actually take. The only information I was able to get was it would take longer than 10,000 miles, but I feel that FORD does know exactly what will happen and how long it will take statistically at least. I don't think it would be reasonable to believe the only damage would be to the converter. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

You can read the basis of this information in the following thread in the posts by Mark ..

<font color="red"> CLICK HERE</font>


Larry, keeper of the <font color="blue">"little secrets" </font> CLICK HERE [img]/ubbthreads/images/graemlins/smile.gif[/img]


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post #7 of 8 (permalink) Old 03-13-2005, 05:44 PM
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Re: Tranny fluid question

I would put this dude on notice, that he is liable for any damage, and then I would make him switch it to synthetic, without any labor.

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post #8 of 8 (permalink) Old 03-14-2005, 12:25 AM Thread Starter
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Re: Tranny fluid question

Well if I could find him then I could...I think that for now all I can do get a new TC and swap in the correct fluid after I purge the system and hope I can get it to hold out until I have the cash for a trip to BTS.

Thanks

Mark

2002 Quad Cab/ Short bed/ BTS Auto/ Ford AIS Intake/ BTS 6 Pos. chip/ DI boost relief valve/ 4in DP no muff all the way back/ Bob's IC boots/ Bob's A/C bypass valve/ Bob's coolant/tranny filter/ 3 Yellow Tops Optimas under the hood/ HID's/ Switched GP's/ And a Really big wish list!
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