Differential Identification is the first and most important step in any differential repair or ratio change.
Careful differential identification will help make sure you get the right parts for the job the first time.
Dana Spicer and Ford Differentials can be identified most accurately by the tag number or axle tube stamp.
Go to: Differential Tags
Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox or the driver’s side door jamb (B-Pillar).
Go to: GM RPO Codes
Whenever possible, reference the tag numbers when ordering parts for your Differential. 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. The chart below shows various differential covers, 3rd Members and housings.
Need help with your differential identification? Call Sierra Gear & Axle at (800)792-2714. Our differential experts are available from 8am to 5pm PST Monday thru Friday.
Found your application and need parts? Locate a Sierra Gear & Axle Distributor near you, or call (800) 792-2714

AAM 9.25″ Dodge RAM '03-'13 Front

AAM 9.25″ Dodge RAM '13-'18 Front

AAM 10.5″ Chrysler Rear

AAM 11.5″ GM / Dodge RAM Rear

AAM 11.8″ RAM & GM Rear

AAM 12.0″ RAM/GM 3500 Rear

AMC Model 20

AMC Model 35 (Dana 35™)

Chrysler 7.25″

Chrysler 8″ IFS

Chrysler 8.25″

Chrysler 8.75″ Third Member

Chrysler 9.25″

Chrysler 9.25″ ZF Rear

Dana 28™

Dana 30™

Dana 30 M186 Jeep® JL Non-Rubi Front

Dana 35™ (AMC Model 35)

Dana 35™ Advantek® M200 Non-Rubicon JL (Gas) Rear

Dana 44™

Dana 44™ HD - Alum. Housing

Dana 44™ Advantek® M210 Jeep JL Rubicon / Gladiator Front

Dana 44™ Advantek® M220 JL/Gladiator/Bronco/Ranger Rear

Dana 50™

Dana 50™ TTB - Twin Traction Beam

Dana 60™

Dana 70™

Dana 80™

Dana M256 - Super 60 2017+ Ford Super Duty Front

Dana M275 - 10.8" 2017+ Ford Super Duty SRW Rear

Dana M300 - 11.8" 2017+ Ford Super Duty DRW Rear

Dana S110™

Dana S135 / S150

Ford 7.5"

Ford 8" 3rd Member

Ford 8.8"

Ford Super 8.8" - 2015+ F150

Ford 9" 3rd Member

Ford 9.75"

Ford 10.25" / 10.5"

GM '55 Passenger

GM '55 Truck

GM 7.25" IFS

GM 7.5" Rear

GM 7.6" (7.625") Rear

GM 7.6" IFS Front

GM 8" Rear

GM 8.2" Rear

GM 8.2" BOP Rear

GM 8.25" IFS

GM 8.5" Rear

GM 8.5" Front

GM 8.6" Rear

GM 12-Bolt Passenger 8.875"

GM 12-Bolt Truck 8.875"

GM 9.25 IFS Front

GM 9.5" Rear

GM 9.5 '98-'13 Rear

GM 9.5 '14+ 12-Bolt Rear

GM 9.25 IFS Front

GM 9.5" Rear

GM 9.76" Rear

GM 10.5" 14-Bolt

Camaro V6 195mm

Camaro V8 218mm

Camaro ZL1 250mm

Pontiac GTO '04-'06

Pontiac G8

Corvette '63-'79

Corvette Dana 36 '84-'96

Corvette Dana 44 '80-'82

Corvette Dana 44HD '84-'96

Corvette GETRAG

Mercedes 215mm / Chrysler H215

Mercedes Sprinter MB215 '02-'06

Mercedes Sprinter MB248 '07+

Nissan M226 '04-'07 (D44)

Nissan M226 '08+ (D44)

Nissan M205 Titan Front

Nissan H233B

Nissan R200 Front '00-'04

Nissan R180A XTerra 05+

Nissan C200K Rear '05+

Suzuki Samurai / Sidekick / Tracker

Toyota 7.5 Early 3rd Member

Toyota 7.5" IFS Front (Early)

Toyota 7.5" IFS Reverse Clamshell

Toyota 8" 4-Cylinder Front/Rear

Toyota 8" V6 / Turbo

Toyota 8" E-Locker

Toyota 8" IFS Reverse Clamshell

Toyota 8.2

Toyota 8.4 Tacoma Rear

Toyota 8.75 Tacoma Rear '16+

Toyota 8.75" IFS Front

Toyota 10.5" 5.7L Tundra

Toyota Landcruiser 8" Reverse Front

Toyota Landcruiser 9.5" Front / Rear

Toyota Landcruiser 9.5" Late Model

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Differential Identification using Tags or RPO Codes is usually the most accurate method. The exception is when the axle you are working on has already been modified by a previous owner. In that case, visual identification comes into play. Once the differential model has been determined, the next step will be to remove the cover (or third member) in order to determine the gear ratio and differential/traction device type.
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Find the application and ratio you need? Locate a Sierra Gear & Axle Distributor near you.
Gear Calculator
Doing a gear ratio change but not sure what you want? Try our Differential Gear Calculator.