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Differential Identification

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

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.

  Differential Identification by Tag Number

Dana Spicer Differential Tags

Dana Spicer Differential Identification Tags

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.

Axle Identification

On GM axles made by Dana, the Bill of Material is usually stamped in the right hand tube underneath the spring. These BOM’s normally start with 60, and the first 2 digits are not typically dropped as in some cases with Dana ID tags.

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 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.



For complete listings of the Differential Parts available for your application, view the West Coast Differentials Catalog located at the top right of this page. We have a huge inventory and orders placed by 4PM Pacific Standard Time can usually ship out the same day!

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.

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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.

AAM-9.25" Differential

AAM 9.25″ Chrysler Front Differential Cover

Image of American Axle Manufacturing 10.5" Differential Cover

AAM 10.5″ Chrysler Differential Cover

Image of AAM 11.5" GM/Chrysler Differential

AAM 11.5″ GM/Chrysler Differential Cover

Image of AMC-Model-20-Differential Cover

AMC Model 20 Differential Cover

AAM 9.25″ Chrysler Front

Go To: AAM 9.25″ Parts

AAM 10.5″ Chrysler

Go To: AAM 10.5″ Parts

AAM 11.5″ GM / Chrysler

Go To: AAM 11.5″ Parts

AMC Model 20

 Go To:  Model 20 Parts

Image of AMC-Model-35-Differential Cover

AMC Model 35 Differential Cover

Image of Chrysler-7.25"-Differential Cover

Chrysler 7.25″ Differential Cover

Image of Chrysler-8"-IFS Differential Unit

Chrysler 8″ IFS Front Differential

Image of Chrysler-8.25"-Differential Cover

Chrysler 8.25″ Differential Cover

AMC Model 35

Go To: Model 35 Parts

Chrysler 7.25″

Go To: Chrysler 7.25″ Parts

Chrysler 8″ IFS

Go To: Chrysler 8″ IFS Parts

Chrysler 8.25″

Go To: Chrysler 8.25″ Parts

Image of Chrysler-8.75"-Differential

Chrysler 8.75″ Differential Third Member

Image of Chrysler-9.25"-Differential

Chrysler 9.25″ Differential Cover

Image of Dana-28-Differential Housing

Dana 28 IFS Differential Housing

Image of Dana-30-Differential

Dana 30 Differential Cover Image

Chrysler 8.75″

Go To: Chrysler 8.75″ Parts

Chrysler 9.25″

Go To: Chrysler 9.25″ Parts

Dana 28

Go To: Dana 28™ Parts

Dana 30

Go To: Dana 30™ Parts

Image of Dana-44-Differential Cover

Dana 44 Differential (Cover)

Image of Dana-50-Differential Cover

Dana 50 Differential (Cover)

Image of Dana-60-Differential Cover

Dana 60 Differential Cover

Image of Dana-70-Differential Cover

Dana 70 Differential Cover

Dana 44

Go To: Dana 44™ Parts

Dana 50

Go To: Dana 50™ Parts

Dana 60

Go To: Dana 60™ Parts

Dana 70

Go To: Dana 70™ Parts

Image of Dana-80-Differential Cover

Dana 80 Differential (Cover)

Image of Dana-S110-Third-Member

Dana S110 Third Member

Image of Ford-7.5"-Differential Cover

Ford 7.5″ Differential (Cover)

Image of Ford-8"-3rd-Member-Differential

Ford 8″ Third Member

Dana 80

Go To: Dana 80™ Parts

Dana S110

Go To: S110/S135/S150 Parts

Ford 7.5″

Go To: Ford 7.5″ Parts

Ford 8″ 3rd Member

Go To: Ford 8″ Parts

Image of Ford-8.8"-Differential Cover

Ford 8.8″ Differential (Cover)

Image of Ford-9-3rd-Member-Differential

Ford 9″ Third Member

Image of Ford-9.75"-Differential Cover

Ford 9.75″ Differential (Cover)

Omage of Ford-10.25"-10.5"-Differential Cover

Ford 10.25″ & 10.5″ (Cover)

Ford 8.8″

Go To: Ford 8.8″ Parts

Ford 9″ Third Member

Go To: Ford 9″ Parts

Ford 9.75″

Go To: Ford 9.75″ Parts

Ford 10.25″ & 10.5″

Go To: Ford 10.25″/10.5″ Parts

Image of GM-55-Passenger-Differential

GM ’55 Passenger Third Member

Image of GM-55-Truck-Differential

GM ’55 Truck Third Member Dropout

Image of GM-7.25"-IFS-Differential

GM 7.25″ IFS Clamshell Differential

Image of GM-7.5"-Differential

GM 7.5″ & 7.625″ Differential (Cover)

GM ’55 Passenger

Go To: ’55 Passenger Parts

GM ’55 Truck

Go To: GM ’55 Truck Parts

GM 7.25″ IFS

Go To: GM 7.25″ IFS Parts

GM 7.5″ / 7.625″

Go To: GM 7.5″/7.625″ Parts

Image of GM-8"-Differential

GM 8″ Differential (Cover)

Image of GM-8.2"-Differential

GM 8.2″ Differential (Cover)

Image of GM-8-2-Buick Olds Pontiac-Differential

GM 8.2″ B.O.P. (Cover)


GM 8.25″ IFS Differential

GM 8″

Go To: GM 8″ Parts

GM 8.2″

Go To: GM 8.2″ Parts

GM 8.2″ B.O.P.

Go To: B.O.P. Parts

GM 8.25″ IFS

Go To: 8.25″ IFS Parts

Image of GM-8.5"-Differential

GM 8.5″ Differential (Cover)

Image of GM-8.6"-Differential

GM 8.6″ Differential (Cover)

Image of GM-12-Bolt-Passenger-Differential Cover

GM 12 Bolt Passenger Differential (Cover)

Image of GM-12-Bolt-Truck-Differential Cover

GM 12 Bolt Truck Differential (Cover)

GM 8.5″

Go To: GM 8.5″ Parts

GM 8.6″

Go To: GM 8.6″ Parts

GM 12 Bolt Passenger (8.875″)

12-Bolt Passenger Parts

GM 12 Bolt Truck (8.875″)

Go To: 12-Bolt Truck Parts

Image of GM-9.25-IFS-Clamshell Differential

GM 9.25″ IFS Clamshell Differential

Image of GM-9.5"-14-Bolt-Differential

GM 9.5″ Differential (Cover)

Image of GM-10.5"-14-Bolt-Differential

GM 10.5″ 14-Bolt Differential (Cover)

Toyota Differential parts for 7.5

Toyota 7.5″ Early 3rd Member Differential

GM 9.25″ IFS

Go To: 9.25″ IFS Parts

GM 9.5″

Go To: GM 9.5″ Parts

GM 10.5″ 14 Bolt

Go To: 14-Bolt Parts

Toyota 7.5″ Early

Go To: 7.5″ Parts

Toyota 7.5" IFS Differential Identification

Toyota 7.5″ IFS Front Differential

Toyota 7.5" Differential Parts

Toyota 7.5″ Reverse Clamshell Differential

Toyota 8" Differential Parts

Toyota 8″ 4-Cylinder 3rd Member Differential

Toyota 8" V6 Differential Parts

Toyota 8″ V6 / Turbo 3rd Member Differential

Toyota 7.5″ IFS

Go To: Toyota 7.5″ Parts

Toyota 7.5″ IFS Clamshell

Go To: Toyota 7.5″ Part

Toyota 8″ 4-Cyl.

Go To: Toyota 8″ Parts

Toyota 8″ V6 / Turbo

Go To: Toyota 8″ Parts

Tacoma T100 8" Differential Parts

Toyota 8″ Tacoma / T100 3rd Member Differential

Toyota 8" Differential Parts

Toyota 8″ Tacoma E-Locker Differential

Landcruiser 8" Differential Parts

Toyota 8″ Landcruiser High-Pinion Front Differential

Image of Toyota-Tundra-8-75-Front-Differential

Toyota Tundra 8.75″ IFS Front Differential

Toyota 8″ Tacoma / T100

Go To: 8” Tacoma ? T100 Parts

Toyota 8″ E-Locker

Go To: 8″ Rear Parts

Toyota 8″ Landcruiser High Pinion

Go To: 8″ Landcruiser Parts

Toyota Landcruiser 8.75″ Reverse IFS

Go To: 8.75″ IFS Parts

9.5" Landcruiser Differential

Toyota Landcruiser 9.5″ Differential Parts

Toyota 10.5" Differential Parts

Toyota 10.5″ Tundra Differential

Toyota 9.5″ Landcruiser

Go To: 9.5″ Landcruiser Parts

Toyota 10.5″ 


Differential Repair Assembly exploded diagrams

Need help identifying Differential Components? Go To: Exploded View Diagrams

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(800) 510-0950

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Application Guides

Differential Parts Application Guide Use our Application Guides to find parts that are available for your vehicle, Including Ring & Pinion Gear Sets, Installation Kits, Positraction and Locking Differentials, Internal Parts, Axle Shafts and more.

2015 Product Catalog

West Coast Differentials Ring Pinion Axles Rearend Parts Click the thumbnail above to view or download our current catalog. Download a PDF copy and save it on your computer for offline viewing or see the Flipbook version online.