Identifying my transmission

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Jan 6, 2019 | 03:33 PM

James Mock

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Identifying my transmission

I have a 6/2003 model year 2003 F250 Super Duty with a 5.4 V-8. Everything I am researching shows two different automatics potentially in this, each using a different fluid type. I cannot locate a tag on the side of the housing, and the pan looks like it could be either, as they are both 20 bolt and shaped similarly. The filters look different, but not wanting to drop the pan to see just yet. I do beleive it is the 16valve engine, which leads me to think it is the 4R100, but not entirely sure. Any suggestions would be appreciated.

Jan 6, 2019 | 04:01 PM

Sam I Am

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From: Fort Smith, Arkansas

It's a 4R100, only automatic available for that year with a 5.4.
It uses Mercon 5 fluid.

Jan 6, 2019 | 07:11 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

Quote:

Originally Posted by Sam I Am

It's a 4R100, only automatic available for that year with a 5.4.
It uses Mercon 5 fluid.

That is correct. The 5R110W was only available with the 6.0L diesel until 2005.

Jan 6, 2019 | 07:51 PM

James Mock

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Thanks for the help. But are we sure on the Mercon V? Seems to be a huge debate that has me just as confused.

Jan 6, 2019 | 07:55 PM

WE3ZS

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From: Media PA

Quote:

Originally Posted by James Mock

Thanks for the help. But are we sure on the Mercon V? Seems to be a huge debate that has me just as confused.

Read the signature of Mark in the post above yours, I think that he qualifies as an expert on the matter and knows that it takes MERCON V.

Jan 6, 2019 | 09:16 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,722

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From: SE Florida

Quote:

Originally Posted by James Mock

Thanks for the help. But are we sure on the Mercon V? Seems to be a huge debate that has me just as confused.

In 2006 Ford changed MERCON V to be compatible with transmissions that used to take MERCON. MERCON was then discontinued. MERCON V is the correct fluid for all 4R100s.

Jan 6, 2019 | 09:16 PM

SoCalAngler

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If you service the trans yourself, Mark Kovalsky has provided a GREAT step by step procedure. I've followed it and it worked great for me. See link below.....

https://www.ford-trucks.com/articles...-transmission/