Differential tag decoding - Diesel Forum - TheDieselStop.com
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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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Old 04-01-2010, 12:09 AM   #1 (permalink)
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Differential tag decoding

Can anyone tell me how to decode my differential tag.

Top row: S 409 F
Bottom Row: 3L73 10 5 9J22
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Old 04-01-2010, 12:26 AM   #2 (permalink)
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Here you go:

I had to update my bookmark so it took me a few minutes longer

Ford Rear Axle Assembly Identification - Page 13 - FORDification.com
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Old 04-01-2010, 12:29 AM   #3 (permalink)
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The only interesting parts of that are:

3L73 = 3.73 gear ratio with the factory "un"limited slip differential. Same as mine.

The rest is gobbly gook build numbers.

Good link, Chuckster.
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Old 04-01-2010, 08:48 AM   #4 (permalink)
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Originally Posted by pcatanza View Post
Can anyone tell me how to decode my differential tag.

Top row: S 409 F
Bottom Row: 3L73 10 5 9J22
Look at your truck. If it is a Ford '99-'03 SuperDuty pickup with single rear wheels (SRW) and a 7.3L diesel engine, then it has a Ford "Sterling" 10.5" rear axle. The "Sterling" means it was manufactured in the Ford axle plant in the little town of Sterling, Michigan.

The only numbers on the axle tag that mean anything to most of us is the "3L73 10 5" at the beginning of the second line. That tells you that you have a 3.73 axle ratio with limited slip and a 10.5" ring gear. If that code were "3 73 10 5", then you would have a 3.73 axle ratio without limited slip, and it would have the 10.5" ring gear.

On most of those axle tags, the first character is covered by a bolt head and/or gunky grease and dirt. So unless you remove the tag and clean it up, you might think it begins with L73 or just 73.
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Old 04-01-2010, 10:08 AM   #5 (permalink)
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As usual, everyone is willing to share their vast knowledge.
I really appreciate all of the assistance.

Looks like I have a 3.73 axle ratio with limited slip and a 10.5" ring gear

We are pulling our 5th wheel to the beach in Aptos California tomorrow.
This is the first trip with this truck, so we will see how it pulls Pacheco Pass.
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Old 04-01-2010, 02:25 PM   #6 (permalink)
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Originally Posted by pcatanza View Post
As usual, everyone is willing to share their vast knowledge.
I really appreciate all of the assistance.

Looks like I have a 3.73 axle ratio with limited slip and a 10.5" ring gear

We are pulling our 5th wheel to the beach in Aptos California tomorrow.
This is the first trip with this truck, so we will see how it pulls Pacheco Pass.
I predict you will have a pleasant experience on the pass. These trucks pull mountain passes with aplomb. I have 3.73 gears on my MY2000 and regularly pull Colorado passes heavily loaded towing with much joy.
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