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Motive Gear Performance Ring and Pinion Sets GZ85390 GM 8.6 in. IRS/ 218mm AAM 3.90 Gears Gears, 3.90:1, 32-spline Pinion, 10-bolt, 218mm, AAM, Set

SKU: MGRGZ85390

Ring and Pinion Gears

Motive Gear Performance Ring and Pinion Sets GZ85390 GM 8.6 in. IRS/ 218mm AAM 3.90 Gears Gears, 3.90:1, 32-spline Pinion, 10-bolt, 218mm, AAM, Set

SKU: MGRGZ85390

Ring and Pinion Gears
A$922.84
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

Motive Gear Performance ring and pinions are perfect for dedicated racing or off-road vehicles. Their gear sets are made from first-run steel, they never use recycled metal. This allows Motive Gear Performance ring and pinions to handle the extreme torque from high-horsepower racing engines. Extensive engineering, computer-controlled heat treatment, superior strength, quality and the widest selection of racing gear ratios, makes Motive Gear Performance ring and pinions the clear winner! Engineered to the highest standards, every Motive Gear Performance product goes through rigid quality control processes in their in-house lab.

Motive Gear Performance also offers a lightweight alternative to standard ring and pinion gear sets. Their AX Series ring and pinions are designed to increase horsepower and efficiency by removing rotating weight. Professional race teams have used custom-lightened drivetrain parts for years, resulting in faster times and more wins. The AX Series gears from Motive are lightened during the manufacturing process; this results in gear sets that have been engineered, not modified. Computer-controlled heat treatment, index tooth spacing, and CNC machining all go into AX Series performance gear sets. Motive Gear Performance: What the pros run!

Part Type

Ring and Pinion Gears

Data: v4.2 - Upd: 2026-10-14 11:10:36

Specifications

Product Attributes - Brand
Motive Gear
Product Attributes - Manufacturer's Part Number
GZ85390
Product Attributes - Part Type
Ring and Pinion Gears
Product Attributes - Product Line
Motive Gear Performance Ring and Pinion Sets
Product Attributes - UPC
698231942246
Product Attributes - Differential Case Design Type
GM 8.6 in. IRS/ 218mm, AAM
Product Attributes - Ring and Pinion Ratio
3.90:1
Product Attributes - Cover Bolts
10
Product Attributes - Ring Gear Bolts
10
Product Attributes - Pinion Spline Count
32
Product Attributes - Ring Gear Rotation
Standard
Product Attributes - Ring Gear Diameter (in.)
8.600 in.
Product Attributes - Pinion Shaft Diameter (in.)
1.876 in.
Product Attributes - Installation Kit Included
No
Product Attributes - Cover Gasket Included
No
Product Attributes - Pinion Shims Included
No
Product Attributes - Carrier Shims Included
No
Product Attributes - Crush Sleeve Included
No
Product Attributes - Pinion Seal Included
No
Product Attributes - Pinion Nut Included
No
Product Attributes - Ring Gear Bolts Included
No
Product Attributes - Head Bearing Included
No
Product Attributes - Tail Bearing Included
No
Product Attributes - Carrier Bearings Included
No
Product Attributes - Axle Seals Included
No
Product Attributes - Axle Bearings Included
No
Product Attributes - Differential Cover Included
No
Product Attributes - Differential Oil Included
No
Product Attributes - Friction Modifier Included
No
Product Attributes - Installation DVD Included
No
Product Attributes - Quantity
Sold as a set.
Product Attributes - Notes
Fits 2008-09 Pontiac G8 models.

Reference Information

Brand Name/s Motive Gear
StreetFX SKU mgrGZ85390
SFX Item ID 4796774
Supplier Item Code 4796774
Manufacturer SKU GZ85390
Manufacturer UPC 698231942246
Alternative References MOTGZ85390, 218mm, 32-spline, 10-bolt

Compatibility

Application Data
  • MakeCHEVROLET
    ModelCAPRICE
    SubmodelPPV
    Beginning Year2011
    Ending Year2017
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Axle LocationRear
    Liter6.0
    CID364
    CC5967
    Engine VIN Code2
  • MakeCHEVROLET
    ModelCAPRICE
    SubmodelPPV
    Beginning Year2012
    Ending Year2017
    Engine TypeV6
    Engine Size3.6L/217
    Engine FamilyGM V6
    Axle LocationRear
    Liter3.6
    CID217
    CC3564
    Engine VIN Code3
  • MakeCHEVROLET
    ModelSS
    SubmodelBASE
    Beginning Year2014
    Ending Year2017
    Engine TypeV8
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Axle LocationRear
    Liter6.2
    CID376
    CC6162
    Engine VIN CodeW
  • MakePONTIAC
    ModelG8
    SubmodelBASE
    Beginning Year2008
    Ending Year2009
    Engine TypeV6
    Engine Size3.6L/217
    Engine FamilyGM V6
    Axle LocationRear
    Liter3.6
    CID217
    CC3564
    Engine VIN Code7
  • MakePONTIAC
    ModelG8
    SubmodelGT
    Beginning Year2008
    Ending Year2009
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Axle LocationRear
    Liter6.0
    CID364
    CC5967
    Engine VIN CodeY
  • MakePONTIAC
    ModelG8
    SubmodelGXP
    Beginning Year2009
    Ending Year2009
    Engine TypeV8
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Axle LocationRear
    Liter6.2
    CID376
    CC6162
    Engine VIN CodeW

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