What gearing do I have?
Thread Starter
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Senior User
Joined: Dec 2002
Posts: 209
Likes: 0
From: Lorain, Ohio
What gearing do I have?
I am getting ready to lift my truck and run 38's and was wondering what gears I have. There no sticker on the door and I can't read anything on the front diff. tag. All I can make out on the rear tag is
V111C
410 10 2 0C31
There is some other numbers before these but the only way to read them is to take the bolt out of the rear that is holding the tag on. Any help as to what this code means would be appreciated. Thanks in Advance.
P.S. The rear and in a Ford 10.25 Truck is a 91 F250
V111C
410 10 2 0C31
There is some other numbers before these but the only way to read them is to take the bolt out of the rear that is holding the tag on. Any help as to what this code means would be appreciated. Thanks in Advance.
P.S. The rear and in a Ford 10.25 Truck is a 91 F250
Thread Starter
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Senior User
Joined: Dec 2002
Posts: 209
Likes: 0
From: Lorain, Ohio
What gearing do I have?
Taking this info that I just learned I went oput and scrubbed all the oil off of my front diff tag and it read 4.09. Is it ok to have 4.09 in front and 4.10 in the rear? I'm thinging that the difference is so little that you wouldn't be able to notice.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
What gearing do I have?
Ford always does that so the front wheels pull slightly in the mud. This makes steering slightly better than if the ratios were the same. It also means you shouldn't ever engage 4WD on a high-traction surface, or you could stretch/break the t-case chain or do other driveline damage.
Posting Guru
Joined: Dec 1999
Posts: 2,351
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From: Benton County, MN
What gearing do I have?
I was curious to see if Ford used two different ratio's in our new FX4 Ranger and found that both front and rear are 4.10's. I'm sure the IFS and rack & pinion steering contributed to this decision.
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Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
What gearing do I have?
There are only certain ratios available for each axle, and sometimes, they're exactly the same. Both the 9" & the D44 offer 3.30, so you'll occasionally find that on early 80's FS trucks.
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Freshman User
Joined: Feb 2003
Posts: 26
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From: Platteville, CO
What gearing do I have?
Hey steve83 - My f150 has 3L55 975 in the Rear but the Front has two sets of numbers printed on the diff itself that says 3.55 976B and 355 88. I know the 975 is 9.75" for the case size. Any Idea what the 976b or the 88 stands for?
Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
What gearing do I have?
Dan-
The 9.75 is the ring gear size, not the case. The 3.55 in the rear is a limited slip. The front is an 8.8" ring gear, offset, reverse cut 3.55 open diff (88 should also have a "." in there). The 976b may be the last four of the part number or a casting mark, I can tell you have a 5.4 from that rear end. They only came on the 5.4's.
-Kerry
The 9.75 is the ring gear size, not the case. The 3.55 in the rear is a limited slip. The front is an 8.8" ring gear, offset, reverse cut 3.55 open diff (88 should also have a "." in there). The 976b may be the last four of the part number or a casting mark, I can tell you have a 5.4 from that rear end. They only came on the 5.4's.
-Kerry
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