Strange Engineering GM 12-Bolt Billet Aluminum Main Caps — Pair

SKU: BJHW_H1121
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Strange Engineering

Strange Engineering engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Strange Engineering lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Increase Differential Rigidity

The GM 12-bolt rear end is a classic performance platform, but it requires reinforcement to handle modern power levels. Strange Engineering Billet Aluminum Main Caps are designed to replace the weaker factory caps, significantly increasing the strength of your differential carrier. By reducing cap deflection, these billet caps prevent gear misalignment and extend the lifespan of your ring and pinion set.

Technical Advantages

  • Billet Aluminum Construction: Offers superior strength-to-weight ratio compared to cast iron.
  • Hardware Included: Comes with all necessary mounting hardware for a straightforward upgrade.
  • Precision Fit: Engineered specifically for GM 12-bolt housings.
  • Enhanced Stability: Minimizes carrier flex under heavy acceleration.

When you upgrade your differential, you are investing in the longevity of your entire drivetrain. These billet caps are a must-have for any high-performance build, providing the structural support needed to transfer power to the ground effectively. Whether you are drag racing or street driving, these caps keep your internals secure. Discover the best in differential reinforcement and performance hardware at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Strange Engineering

Strange Engineering engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Strange Engineering lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Increase Differential Rigidity

The GM 12-bolt rear end is a classic performance platform, but it requires reinforcement to handle modern power levels. Strange Engineering Billet Aluminum Main Caps are designed to replace the weaker factory caps, significantly increasing the strength of your differential carrier. By reducing cap deflection, these billet caps prevent gear misalignment and extend the lifespan of your ring and pinion set.

Technical Advantages

  • Billet Aluminum Construction: Offers superior strength-to-weight ratio compared to cast iron.
  • Hardware Included: Comes with all necessary mounting hardware for a straightforward upgrade.
  • Precision Fit: Engineered specifically for GM 12-bolt housings.
  • Enhanced Stability: Minimizes carrier flex under heavy acceleration.

When you upgrade your differential, you are investing in the longevity of your entire drivetrain. These billet caps are a must-have for any high-performance build, providing the structural support needed to transfer power to the ground effectively. Whether you are drag racing or street driving, these caps keep your internals secure. Discover the best in differential reinforcement and performance hardware at GGCRACING.

Product Details

Product Description

About Strange Engineering

Strange Engineering engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Strange Engineering lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Increase Differential Rigidity

The GM 12-bolt rear end is a classic performance platform, but it requires reinforcement to handle modern power levels. Strange Engineering Billet Aluminum Main Caps are designed to replace the weaker factory caps, significantly increasing the strength of your differential carrier. By reducing cap deflection, these billet caps prevent gear misalignment and extend the lifespan of your ring and pinion set.

Technical Advantages

  • Billet Aluminum Construction: Offers superior strength-to-weight ratio compared to cast iron.
  • Hardware Included: Comes with all necessary mounting hardware for a straightforward upgrade.
  • Precision Fit: Engineered specifically for GM 12-bolt housings.
  • Enhanced Stability: Minimizes carrier flex under heavy acceleration.

When you upgrade your differential, you are investing in the longevity of your entire drivetrain. These billet caps are a must-have for any high-performance build, providing the structural support needed to transfer power to the ground effectively. Whether you are drag racing or street driving, these caps keep your internals secure. Discover the best in differential reinforcement and performance hardware at GGCRACING.

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