Rear end gears ????
Super Moderator
Joined: Apr 2004
Posts: 34,496
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Is this in your '83 F100?
I can't find it. S318B does not show up as a code on the decoder ring I look at.
Usually the ratio is clearer as well. Any chance you can clean that tag up and get the angle looking at the other side of the attachment stud?
I can't find it. S318B does not show up as a code on the decoder ring I look at.
Usually the ratio is clearer as well. Any chance you can clean that tag up and get the angle looking at the other side of the attachment stud?
Fleet Mechanic
Joined: Jul 2003
Posts: 1,844
Likes: 129
From: Atlantic Canada
You need to clean the tag and get the rest of the info to the left...
Should be WDM CN?
The 3F13 is the date code? (1983, February 13)
The 9 is the ring gear...
The "0" in front of the 9 is the end of the ratio...like 3:50, or 4:10, etc...
The S318B is the differential model code?
See how the tag in this thread looks?
https://www.ford-trucks.com/forums/9...ification.html
Should be WDM CN?
The 3F13 is the date code? (1983, February 13)
The 9 is the ring gear...
The "0" in front of the 9 is the end of the ratio...like 3:50, or 4:10, etc...
The S318B is the differential model code?
See how the tag in this thread looks?
https://www.ford-trucks.com/forums/9...ification.html
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
Yes, your ratio is usually half cut-off by the hole they punched for the mounting bolt. So clean it off closer to the bolt/stud, or just take the tag off completely and clean it up. They usually punch out the "3" but you can read the rest. As in "3.50".
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The tag is so crusty, I cannot make out anything other than this code.
AXLE code printed on the Certification Label, glued to the left door face below the latch. Post what it is.
Originally Posted by Rembrant
3F13 is the date code (1983 February 
13).
13).
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