How do you read a Ford rear differential tag?

Reading a Ford Rear Differential Tag
To read a Ford rear differential tag, you can follow these steps:
1. Locate the Tag: The tag is typically attached to the differential casing on the rear axle in most cases. If it’s not on the tag, the same markings can be found on the casing and the long shaft of the axle.
– The tag will provide information such as the date the axle was made, the factory, the ratio, pinion gear, and model, which are all essential for rebuilding or repairing the axle.
2. Decipher the Tag: The tag number is ordered as year, month, and day, with the month of manufacture following the format of A for January, B for February, C for March, and so on. For example, a Ford tag number might appear as 12D04, signifying April 4, 2012.
3. Understand the Information: The top row of the tag contains numbers that can be decoded to determine the differential ratio. For example, a tag with the number 415B on the top row may indicate a 4.30 Limited Slip differential.
4. Consult Experts if Needed: If in doubt, it’s advisable to consult differential experts for professional technical support.
By following these steps, you can effectively read a Ford rear differential tag and obtain important information about the axle.

How do you identify a differential tag?

If the ID tag or stamp is missing or unreadable, differentials can be identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.

What is the ID tag on a Ford 8.8 rear end?

A Ford identifying tag is attached to one of the rear cover bolts. The four-letter code on the top right of the tag will be a dead giveaway as to whether you have found an 8.8-inch axle. The first three digits of these codes are listed with the original applications mentioned on the chart.

How do I identify a Ford rear end?

The ID tag can be your friend. It will tell you the gear ratio, rearend style, and whether it has limited-slip. Also on the tag is an ID number, which, until 1985, included four to five letters, no numbers. Almost all 8.8s—and all post-1986 Ford rearends—have letters and numbers.

How do you decode a Ford rear end tag?

Whether. It needs an additive or not usually that’s on those tags also. As far as identifying Ford. Gives most of the Fords will have the same format. So your super duties your f-150 is your Mustangs.

What are the numbers on the rear differential?

In simple terms, the numbers mean how many turns of the drive shaft to one turn of the rear wheel. If you are cruising down the freeway at 60 MPH with 3.00 gears, in a typical high gear with a 1:1 output ratio, it simply means that the drive shaft (engine) is spinning 3 times for every 1 rotation of your tire.

How do I identify my Ford axle?

FORD AXLE IDENTIFICATION TAGS
The location of Ford identification tags will vary by model, but most are located on a carrier cover bolt. The Ring Gear Size (differential type) and the Gear Ratio will be printed on the tag (as well as whether or not the differential is limited slip).

What do the numbers on a differential mean?

Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel.

How do I know what kind of rear differential I have?

How to Identify Your Differential and Axle Type

1. Cover Bolt Count. Since most differentials have a unique cover bolt pattern i.e. 10-bolt, 12-bolt, or 14-bolt, counting them up will narrow the field and help you with identification.
2. Axle Flotation.
3. Get Your Spline In Line.
4. Spec Out Your Hub.
5. Pinion Size & Ring Gear Diameter.

What do the numbers on a rear end tag mean?

The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. Traditional BOM’s are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61. On some tags, the first 2 digits don’t appear on the tag, but they must be used to identify the axle.

How do I know what gear my rear end is?

Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a 3.73 gear ratio. If you get approximately 2 3/4 revolutions, you have a 2.76 gear ratio.