Rear End Parts
FAQs
How do I know which rear end parts are right for my chassis?
Start with your axle type, rear geometry, and the forces your car sees under acceleration and corner exit. Matching spacers, shims, and supporting hardware to your drivetrain layout ensures a clean power delivery and stable handling.
When should I use rear coil spring spacers?
Spacers are used to fine-tune ride height and crossweight without swapping springs. If your rear suspension needs small adjustments in rate or balance, spacers give you control without a full teardown.
What does a differential shim kit do?
A differential shim kit sets backlash and bearing preload inside the rear end. Proper shimming prevents gear noise, reduces heat, and keeps the ring-and-pinion running smoothly under torque.
How do rear end components affect traction and corner exit?
Correct spacing, preload, and alignment help the rear tires maintain grip under throttle. When everything is set properly, the car stays settled through bumps and powers off the corner without a wheel hop or bind.
Do rear end setup needs differ between different racing surfaces?
Yes. Dirt cars typically run looser driveline tolerances to handle constant movement, while asphalt cars rely on tighter settings and consistent shimming to control heat and reduce wear.
How are Earnhardt rear end components verified before reaching the site?
Each spacer, shim, and rear end part is inspected for thickness accuracy, machining precision, and fitment repeatability. Components are also evaluated under torque load and heat cycling to confirm long-term stability in real race environments.
Can Earnhardt help me choose the correct shims or spacers for my build?
Our team can guide you through preload adjustments, ride-height needs, and compatibility questions to make sure your rear end stays reliable and consistent.
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At Earnhardt Technologies Group, racing is in our DNA. Every component is precision-machined in Mooresville, NC, built to endure the toughest conditions on the track.











