800-720-0950
For use with GM Axles
RING & PINION GEAR SETS

Sierra Gear & Axle has a complete line of Ring and Pinion Gears for GM axles.

Our Ring and Pinion Gears for GM axles are reasonably priced and are the highest quality aftermarket gear sets available. Gear Sets from Sierra Gear are engineered and manufactured for easy setup, quiet operation and long life.

Applications include everything from the GM ’55 Truck and Passenger axles all the way thru the 11.5″ AAM Rear Axle and everything in between. 

Complete your differential ratio change, rebuild, repair or overhaul with one of our Differential Repair and Installation Kits.

Not sure which ring and pinion gear ratio you want? Use our Differential Gear Ratio Calculator or call one of our technical experts for advice.

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Application Chart:

Ring and Pinion Gear Sets for use with GM Differentials

Ring and Pinion Gear Catalog

GM AXLES– Ring and Pinion Gear Sets
GM ’55 Passenger Sierra Gear & Axle Part #
GM ’55 Passenger – 3.08 Ratio R&P SG GM55P-308
GM ’55 Passenger – 3.70 Ratio R&P SG GM55P-370
GM ’55 Truck Sierra Gear & Axle Part #
GM ’55 Truck – 3.38 Ratio R&P SG GM55T-338
GM Corvette Sierra Gear & Axle Part #
’63-’79 Corvette – 3.55 Ratio R&P SG GMVET-355
’63-’79 Corvette – 3.73 Ratio R&P SG GMVET-373
’97-’13 C5/C6 Corvette Getrag – 3.42 Ratio R&P SG GMVET-342GR
’97-’13 C5/C6 Corvette Getrag – 3.73 Ratio R&P SG GMVET-373GR
’97-’13 C5 /C6 Corvette Getrag – 3.90 Ratio R&P SG GMVET-390GR
’97-’13 C5 /C6 Corvette Getrag – 4.11 Ratio R&P SG GMVET-411GR
’97-’13 C5 /C6 Corvette Getrag – 4.11 Ratio R&P THICK SG GMVET-411GRT
’05-’13 C6 ZO6 Corvette Getrag – 3.90 Ratio R&P SG GMVET-390C6
’05-’13 C6 ZO6 Corvette Getrag – 4.10 Ratio R&P SG GMVET-410C6
’14-’17 C7 Corvette – 3.90 Ratio R&P SG GMVET-390C7
’14-’17 C7 Corvette – 4.10 Ratio R&P SG GMVET-410C7
7.25″ GM IFS Front Sierra Gear & Axle Part #
7.25″ GM IFS Front – 4.11 Ratio R&P SG GM7.25-411R
7.25″ GM IFS Front – 4.56 Ratio R&P SG GM7.25-456R
7.5″ & 7.625″ GM Sierra Gear & Axle Part #
7.5″ & 7.625″ GM – 2.73 Ratio R&P SG GM7.5-273
7.5″ & 7.625″ GM – 3.08 Ratio R&P SG GM7.5-308
7.5″ & 7.625″ GM – 3.23 Ratio R&P SG GM7.5-323
7.5″ & 7.625″ GM – 3.42 Ratio R&P SG GM7.5-342
7.5″ & 7.625″ GM – 3.42 Ratio R&P THICK SG GM7.5-342T
7.5″ & 7.625″ GM – 3.55 Ratio R&P SG GM7.5-355
7.5″ & 7.625″ GM – 3.73 Ratio R&P SG GM7.5-373
7.5″ & 7.625″ GM – 3.73 Ratio R&P THICK SG GM7.5-373T
7.5″ & 7.625″ GM – 3.90 Ratio R&P SG GM7.5-390
7.5″ & 7.625″ GM – 4.10 Ratio R&P SG GM7.5-411
7.5″ & 7.625″ GM – 4.10 Ratio R&P THICK SG GM7.5-411T
7.5″ & 7.625″ GM – 4.56 Ratio R&P SG GM7.5-456
8″ GTO – ’04-’06 Sierra Gear & Axle Part #
GM 8″ GTO – 3.70 Ratio R&P SG GTO-370
GM 8″ GTO – 3.90 Ratio R&P SG GTO-390
GM 8″ GTO – 4.11 Ratio R&P SG GTO-411
8.2″ Buick Oldsmobile Pontiac (B.O.P) Sierra Gear & Axle Part #
8.2″ – Buick Olds Pontiac – 3.36 Ratio R&P SG BP8.2-336
8.2″ – Buick Olds Pontiac – 3.55 Ratio R&P SG BP8.2-355
8.2″ – Buick Olds Pontiac 3.73 Ratio R&P SG BP8.2-373
8.2″ – Buick Olds Pontiac – 3.90 Ratio R&P SG BP8.2-390
8.2″ – Buick Olds Pontiac – 4.11 Ratio R&P SG BP8.2-411
8.2″ GM Sierra Gear & Axle Part #
8.2″ GM – 3.08 Ratio R&P SG GM8.2-308
8.2″ GM – 3.36 Ratio R&P SG GM8.2-336
8.2″ GM – 3.36 Ratio Premium R&P SGPGM8.2-336
8.2″ GM – 3.55 Ratio R&P SG GM8.2-355
8.2″ GM – 3.55 Ratio Premium R&P SGPGM8.2-355
8.2″ GM – 3.73 Ratio R&P SG GM8.2-373
8.2″ GM – 3.73 Ratio Premium R&P SGPGM8.2-373
8.2″ GM – 3.90 Ratio Premium R&P SGPGM8.2-390
8.2″ GM – 4.11 Ratio R&P SG GM8.2-411
8.2″ GM – 4.11 Ratio Premium R&P SGPGM8.2-411
8.2″ GM – 4.56 Ratio Premium R&P SGPGM8.2-456
8.25″ GM IFS Front Sierra Gear & Axle Part #
8.25″ GM IFS Front – 3.42 Ratio R&P SG GM8.25-342R
8.25″ GM IFS Front 3.73 Ratio R&P SG GM8.25-373R
8.25″ GM IFS Front 4.11 Ratio R&P SG GM8.25-411R
8.25″ GM IFS Front 4.30 Ratio R&P SG GM8.25-430R
8.25″ GM IFS Front 4.56 Ratio R&P SG GM8.25-456R
8.25″ GM IFS Front 4.88 Ratio R&P SG GM8.25-488R
8.25″ GM IFS Front 5.13 Ratio R&P SG GM8.25-513R
8.5″/ 8.625″ GM Sierra Gear & Axle Part #
8.5″ GM 2.73 Ratio R&P SG GM8.5-273
8.5″ GM 3.08 Ratio R&P SG GM8.5-308
8.5″ GM 3.23 Ratio R&P SG GM8.5-323
8.5″ GM 3.42 Ratio R&P SG GM8.5-342
8.5″ GM 3.42 Ratio Premium R&P SGPGM8.5-342
8.5″ GM 3.73 Ratio R&P SG GM8.5-373
8.5″ GM 3.73 Ratio Premium R&P SGPGM8.5-373
8.5″ GM 3.90 Ratio R&P SG GM8.5-390
8.5″ GM 4.11 Ratio R&P SG GM8.5-411
8.5″ GM 4.11 Ratio Premium R&P SGPGM8.5-411
8.5″ GM 4.30 Ratio R&P SG GM8.5-430
8.5″ GM 4.56 Ratio R&P SG GM8.5-456
8.5″ GM 4.56 Ratio Premium R&P SGPGM8.5-456
8.5″ GM 4.88 Ratio R&P SG GM8.5-488
8.5″ GM 4.88 Ratio Premium R&P SGPGM8.5-488
8.5″ GM 5.13 Ratio R&P SG GM8.5-513
8.5″ GM 5.13 Ratio Premium R&P SGPGM8.5-513
8.5″ GM 5.57 Ratio R&P SG GM8.5-557
8.5″ Pontiac G8 3.27 Ratio R&P SG G8-327
8.5″ Pontiac G8 3.45 Ratio R&P SG G8-345
8.5″ Pontiac G8 3.70 Ratio R&P SG G8-370
8.5″ Pontiac G8 3.90 Ratio R&P SG G8-390
8.5″ Pontiac G8 4.11 Ratio R&P SG G8-411
8.6″ V8 Camaro 3.27 Ratio R&P – ’10 – ’15 SG GM8.6-327C
8.6″ V8 Camaro 3.45 Ratio R&P – ’10 – ’15 SG GM8.6-345C
8.6″ V8 Camaro 3.90 Ratio R&P – ’10 – ’15 SG GM8.6-390C
8.6″ V8 Camaro 4.11 Ratio R&P – ’10 – ’15 SG GM8.6-411C
8.875″ GM 12-Bolt Passenger Sierra Gear & Axle Part #
GM 12 Bolt Passenger 3.08 Ratio R&P SG GM12P-308
GM 12 Bolt Passenger 3.42 Ratio R&P SG GM12P-342
GM 12 Bolt Passenger 3.42 Ratio Premium R&P SGPGM12P-342
GM 12 Bolt Passenger 3.55 Ratio R&P SG GM12P-355
GM 12 Bolt Passenger 3.55 Ratio Premium R&P SGPGM12P-355
GM 12 Bolt Passenger 3.73 Ratio R&P SG GM12P-373
GM 12 Bolt Passenger 3.73 Ratio R&P THIN SG GM12P-373-
GM 12 Bolt Passenger 3.73 Ratio Premium R&P SGPGM12P-373
GM 12 Bolt Passenger 3.90 Ratio R&P SG GM12P-390
GM 12 Bolt Passenger 3.90 Ratio Premium R&P SGPGM12P-390
GM 12 Bolt Passenger 4.11 Ratio R&P SG GM12P-411
GM 12 Bolt Passenger 4.11 Ratio R&P THICK SG GM12P-411T
GM 12 Bolt Passenger 4.11 Ratio Premium R&P THICK SGPGM12P-411T
GM 12 Bolt Passenger 4.56 Ratio R&P SG GM12P-456
GM 12 Bolt Passenger 4.56 Ratio Pro R&P SG GM12P-456P
GM 12 Bolt Passenger 5.14 Ratio R&P SG GM12P-514
GM 12 Bolt Passenger 5.14 Ratio Pro R&P SG GM12P-514P
8.875″ GM 12-Bolt Truck Sierra Gear & Axle Part #
GM 12 Bolt Truck 3.08 Ratio R&P SG GM12T-308
GM 12 Bolt Truck 3.08 Ratio Premium R&P SGPGM12T-308
GM 12 Bolt Truck 3.42 Ratio R&P SG GM12T-342
GM 12 Bolt Truck 3.42 Ratio Premium R&P SGPGM12T-342
GM 12 Bolt Truck 3.73 Ratio R&P SG GM12T-373
GM 12 Bolt Truck 3.73 Ratio Premium R&P SGPGM12T-373
GM 12 Bolt Truck 3.73 Ratio R&P THICK SG GM12T-373T
GM 12 Bolt Truck 3.73 Ratio Premium R&P THICK SGPGM12T-373T
GM 12 Bolt Truck 4.11 Ratio R&P SG GM12T-411
GM 12 Bolt Truck 4.11 Ratio Premium R&P SGPGM12T-411
GM 12 Bolt Truck 4.11 Ratio R&P THICK SG GM12T-411T
GM 12 Bolt Truck 4.11 Ratio Premium R&P THICK SGPGM12T-411T
GM 12 Bolt Truck 4.56 Ratio R&P SG GM12T-456
GM 12 Bolt Truck 4.56 Ratio Premium R&P SGPGM12T-456
GM 12 Bolt Truck 4.56 Ratio R&P THICK SG GM12T-456T
GM 12 Bolt Truck 4.88 Ratio R&P THICK SG GM12T-488T
9.25″ GM IFS Front Sierra Gear & Axle Part #
9.25″ GM IFS Front 4.11 Ratio R&P SG GM9.25-411R
9.25″ GM IFS Front 4.56 Ratio R&P SG GM9.25-456R
9.25″ GM IFS Front 4.88 Ratio R&P SG GM9.25-488R
9.25″ GM IFS Front 5.13 Ratio R&P SG GM9.25-513R
9.25″ GM IFS Front 5.38 Ratio R&P SG GM9.25-538R
9.5″ GM Sierra Gear & Axle Part #
9.5″ GM 3.42 Ratio R&P SG GM9.5-342
9.5″ GM 3.73 Ratio R&P SG GM9.5-373
9.5″ GM 4.11 Ratio R&P SG GM9.5-411
9.5″ GM 4.56 Ratio R&P SG GM9.5-456
9.5″ GM 4.88 Ratio R&P SG GM9.5-488
9.5″ GM 5.13 Ratio R&P SG GM9.5-513
9.5″ GM 5.38 Ratio R&P SG GM9.5-538
9.5″ GM ’14 & Up 12-Bolt 3.08 Ratio R&P SG GM9.5-308B
9.5″ GM ’14 & Up 12-Bolt 3.42 Ratio R&P SG GM9.5-342B
9.5″ GM ’14 & Up 12-Bolt 3.73 Ratio R&P SG GM9.5-373B
9.5″ GM ’14 & Up 12-Bolt 4.11 Ratio R&P SG GM9.5-411B
9.5″ GM ’14 & Up 12-Bolt 4.30 Ratio R&P SG GM9.5-430B
9.5″ GM ’14 & Up 12-Bolt 4.56 Ratio R&P SG GM9.5-456B
9.5″ GM ’14 & Up 12-Bolt 4.88 Ratio R&P SG GM9.5-488B
10.5″ GM 14-Bolt Truck Sierra Gear & Axle Part #
10.5″ GM 14-Bolt Truck 3.42 Ratio R&P SG GM10.5-342
10.5″ GM 14-Bolt Truck 3.73 Ratio R&P SG GM10.5-373
10.5″ GM 14-Bolt Truck 4.10 Ratio R&P SG GM10.5-411
10.5″ GM 14-Bolt Truck 4.56 Ratio R&P SG GM10.5-456
10.5″ GM 14-Bolt Truck 4.56 Ratio R&P THICK SG GM10.5-456T
10.5″ GM 14-Bolt Truck 4.88 Ratio R&P THICK SG GM10.5-488T
10.5″ GM 14-Bolt Truck 5.13 Ratio R&P THICK SG GM10.5-513T
10.5″ GM 14-Bolt Truck 5.38 Ratio R&P THICK SG GM10.5-538T
11.5″ GM Sierra Gear & Axle Part #
11.5″ GM 3.42 Ratio R&P SG GM11.5-342
11.5″ GM 3.73 Ratio R&P SG GM11.5-373
11.5″ GM 4.11 Ratio R&P SG GM11.5-411
11.5″ GM 4.56 Ratio R&P SG GM11.5-456
11.5″ GM 4.88 Ratio R&P SG GM11.5-488
11.5″ GM 5.13 Ratio R&P SG GM11.5-513
11.5″ GM 5.38 Ratio R&P SG GM11.5-538

 

ISOTROPIC SUPERFINISHING

Any of our Ring & Pinion gears can be ordered “polished” using our in-house Isotropic Superfinishing process.

Simply put, Isotropic Superfinishing significantly reduces the surface imperfections that remain after a Ring and Pinion Gear set is manufactured. The result is a cooler, quieter and longer lasting gear set. At West Coast Differentials, the process we use is chemically accelerated vibratory surface finishing. This is technically not a polishing process, however the resulting finish does have a polished appearance. This process eliminates surface imperfections without removing material or changing the physical dimensions of the part.
This finishing process is widely used in racing applications where a conventional break-in process is not feasible, and where optimum performance is not an option.

BENEFITS of ISOTROPIC SUPERFINISHING

  • Reduced Friction
  • Reduced Contact Wear
  • Reduced Heat
  • Increased Durability
  • Improved Oil Retention
  • Lower Operating Temperature
  • Reduced Noise & Vibration
  • Increased Fuel Economy
  • Reduced Break-In Requirements
  • Reduced Maintenance

For lead time and pricing, please call Sierra Gear & Axle directly at (800) 792-2714

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