Differential and Axle Identification

Accurate Differential Identification is the first and most important step in your differential repair, upgrade or overhaul project. The following information is provided to help you identify the differential you are working on. If in doubt, consult one of our differential experts at (800)510-0950! Professional technical support is available Monday thru Friday from 8am to 5pm Pacific Standard Time.

On this page:  Differential Identification by Tag Number  |  Visual Differential Identification


Differential Identification by Tag Number

The most accurate differential identification is provided by the bottom line of the tag number or axle tube stamp. Differential tags can easily be used to identify Dana and Ford differentials.


Dana Spicer Differential Tags

Dana Spicer Differential Identification Tags


Dana Spicer B.O.M. Numbers

Axle Identification Numbering Schematic

The Bill of Material (BOM) number is used to identify Dana differentials. 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. For instance, you might see 5561-1 for the BOM, but the 60 has been dropped, and one would need to use 605561-1. Later BOM’s may start with the first 3 digits of 200, but these are typically not dropped from the tag.

The BOM may be used with the Dana Expert to identify all aspects of this particular axle. Make sure to select the appropriate Light Duty or Heavy Duty section of The Expert.


Ford Differential Tags

Ford Differential Identification Tag

Ford differential tags are very straightforward, as indicated above. The Month of Manufacture uses the following format:
A = January, B = February, C = March, etc.


GM RPO Identification Codes

GM RPO Codes Axle identification

GM Vehicles come with a RPO code tag, usually located in the vehicles glovebox or door jamb. These tags have a wealth of information about your specific vehicle’s equipment and specifications. Read more about GM RPO Axle Identification Codes


Identifying Components

Not sure what the part you need is called? Use our Exploded View Diagrams to identify the part by name. This way we’ll be on the same page when you call!

Gear Axle Differential Exploded Views


Technical & Sales Assistance

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Need help identifying your differential or not sure which replacement or performance parts you need? Call our staff of differential experts at (800)510-0950. We’re here to help Monday thru Friday from 8AM to 5PM PST

Visual Differential Identification

Without an ID tag, differentials are 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. Dropout differentials are also referred to as 3rd members or pumpkins. The chart below shows various differential covers and 3rd Members.

American Axle 9.25 Chrysler Dodge RamAAM 9.25″ Chrysler

AAM 9.25″ Chrysler Parts

AAM 10.5 Chrysler Dodge RamAAM 10.5″ Chrysler

AAM 10.5″ Chrysler Parts

AMC Model 20 Jeep Parts

AMC Model 20

AMC Model 20 Parts

AMC Jeep Model 35AMC Model 35

AMC Model 35 Parts

Chrysler 7.25 Rear DifferentialChrysler 7.25″

Chrysler 7.25″ Parts

Chrysler Dodge Aspen, Dodge Dakota, Dodge Durango, Dodge Ram 1500 1/2 TonChrysler 8″ IFS

Chrysler 8″ IFS Parts

Chrysler 8.25″

Chrysler 8.25″ Parts

Chrysler 8.75″

Chrysler 8.75″ Parts

Chrysler 9.25 Differential PartsChrysler 9.25″

Chrysler 9.25″ Parts

Dana 20 Differential Parts Gear AxleDana 28

Dana 28 Parts

Dana 30 Differential Parts Gear AxleDana 30™

Dana 30 Parts

Dana 44 Didfferential Parts Gear AxleDana 44

Dana 44 Parts

Dana 50 Differential Parts Gear AxleDana 50

Dana 50 Parts

Dana 60

Dana 60 Parts

Dana 70 Differential Parts Gear AxleDana 70

Dana 70 Parts

Dana 80 Differential Parts Gear AxleDana 80

Dana 80 Parts

Dana S110 Differential Parts Gear AxleDana S110

Dana S110 Parts

Dana S135 S150 Differential PartsDana S135 / S110

Dana S135 / S150 Parts

Ford 7.5" Differential Parts Gear AxleFord 7.5″

Ford 7.5″ Parts

Ford 8 Third Member Differential Parts Gear AxleFord 8″

Ford 8″ Parts

Ford 8.8" Differential Parts Gear AxleFord 8.8″

Ford 8.8″ Parts

Ford 9 Differential Parts Gear AxleFord 9″

Ford 9″ Parts

Ford 9.75 Differential Parts Gear AxleFord 9.75″

Ford 9.75″ Parts

Ford 10.25 Ford 10.5 Differential Parts Gear AxleFord 10.25″ / 10.5″

Ford 10.25 / 10.5 Parts

GM 55 Passenger Differential Parts Gear AxleGM ’55 Passenger

GM ’55 Passenger Parts

GM 55 Truck Differential Parts Gear AxleGM ’55 Truck

GM ’55 Truck Parts

GM 7.25 IFS Differential Parts Gear AxleGM 7.25″ IFS

GM 7.25″ IFS Parts

GM 7.5 GM 7.625 Differential Parts Gear AxleGM 7.5″ & 7.625″

GM 7.5″ / 7.625″ Parts

GM 8 Differential Parts Gear AxleGM 8″

GM 8″ Parts

GM 8.2 Differential Parts Gear AxleGM 8.2″

GM 8.2″ Parts

GM Buick Olds Pontiac Differential Parts Gear AxleGM 8.2″ B.O.P.

GM 8.2″ B.O.P. Parts

GM 8.25 IFS Differential Parts Gear AxleGM 8.25″ IFS

GM 8.25″ IFS Parts

GM 8.5 GM 8.625 Differential Parts Gear AxleGM 8.5″

GM 8.5″ Parts

GM 8.5 Front Differential PartsGM 8.5″ Front

GM 8.5″ Front Parts

GM 8.6" Differential Parts Gear AxleGM 8.6″

GM 8.6″ Parts

GM 8.875 12 bolt passenger differential parts gear axleGM 8.875″ 12-Bolt Passenger

GM 12-Bolt Passenger Parts

GM 8.875 12 Bolt Truck Differential Parts Gear Axle Ring PinionGM 8.875″ 12-Bolt Truck

GM 12-Bolt Truck Parts

GM 9.25 IFS Front Differential Parts Gear Axle Ring PinionGM 9.25 IFS

GM 9.25″ IFS Parts

GM 14 Bolt Differential Parts Gear Axle Ring PinionGM 9.5″ 14-Bolt

GM 9.5″ 14-Bolt Parts

GM 10.5 14 Bolt Differential Parts Gear Axle Ring PinionGM 10.5″ 14-Bolt

GM 10.5″ 14-Bolt Parts

Toyota Differential parts for 7.5Toyota 7.5″ Early

Toyota Early 7.5″ Parts

Toyota 7.5" IFS Front Differential Parts Gear Axle Ring PinionToyota 7.5″ IFS

Toyota 7.5″ IFS Parts

Toyota 7.5" Reverse Clamshell Differential Parts Gear Axle Ring PinionToyota 7.5″ IFS Clamshell

Toyota 7.5″ IFS Reverse Parts

Toyota 8 differential parts gear axle ring pinionToyota 8″ 4-Cyl.

Toyota 8″ 4-Cyl. Parts

Toyota 8" V6 / Turbo DifferentialToyota 8″ V6 / Turbo

Toyota 8″ V6 Parts

Toyota Tacoma 8" E-Locker Differential Parts Gear Axle Ring PinionToyota 8″ w/E-Locker

Toyota 8″ Parts

Toyota 8 Reverse Clamshell 4Runner FJ Tacoma GX PartsToyota 8″ Reverse IFS Clamshell

Toyota 8″ Clamshell Parts

Landcruiser 8" Differential Parts Gear Axle Ring PinionToyota Landcruiser 8″ Front

Landcruiser 8″ Parts

Toyota Tundra Landcruiser Front Differential Parts Gear Axle Ring PinionToyota 8.75″ Reverse IFS

Toyota 8.75″ Parts

9.5" Landcruiser Differential Parts Gear Axle Ring PinionToyota Landcruiser 9.5″

Toyota 9.5″ Parts

Toyota 10.5" Differential Parts Gear Axle Ring PinionToyota Tundra 5.7L 10.5″

Toyota Tundra 10.5″ Parts

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Need your parts ASAP? For the fastest service, call our Differential Parts Experts at (800) 510-0950 for immediate assistance. We available to help Monday thru Friday from 8am to 5pm, and most orders placed by 4pm ship out the SAME DAY!

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