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Drivetrain› Differentials and Rear-End Components
DETROIT SPEED ENGINEERING
Detroit Speed 4.10 Rear Differential Assembly
SKU: 91-10004
Moderate — 2–4 hours
Overview
This unit is specifically built for compatible GM 12-bolt rear axle applications that utilize 30-spline axles. It is important to confirm your specific rear axle type and spline count before ordering. The selection of a 4.10 final-drive ratio should also be considered in conjunction with your vehicle's transmission gearing, tire diameter, engine operating range, and intended use to ensure optimal performance.
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Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | DETROIT SPEED ENGINEERING |
| Part Number | 91-10004 |
| Category | Drivetrain |
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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