SKU: MEI3250ALU
MPN: 3250ALU
The Ford 9-inch aluminum carrier case with 3.250 OD bearing is the backbone of serious rear-axle builds, designed for mechanics and enthusiasts pushing vintage and modified Ford platforms to their limits. This precision-engineered component houses the differential gearing and bearing assembly that transfers engine power to both rear wheels while allowing independent rotation during cornering. Whether you're rebuilding a stock 9-inch or upgrading to a higher-performance setup, the carrier case is non-negotiable—it's where durability meets geometry.
Constructed from lightweight aluminum, this carrier case reduces unsprung weight compared to iron alternatives, improving suspension response and acceleration without sacrificing strength. The 3.250-inch outer diameter bearing specification is critical for load distribution under acceleration, braking, and cornering forces; this size and tolerance directly impact gear mesh alignment and carrier preload tuning. The aluminum construction also improves heat dissipation during sustained driving, reducing thermal stress on differential fluid and extending component life during track days or heavy towing scenarios. Weighing 19.6 pounds and dimensioned at 12.5 x 9.4 x 12.8 inches, this case integrates seamlessly into stock and modified 9-inch housings across Mustangs, Fairlanes, Torinos, and truck platforms.
Rebuilt or new 9-inch axles demand precision carrier work—gear ratios, locker installation, and strength upgrades all depend on a quality case foundation. This aluminum carrier case is essential for anyone upgrading to Positraction, Detroit Locker, or spool differentials, as bearing preload and case clearances directly affect engagement and longevity. Proper installation requires dial indicator setup and adherence to Ford specifications; verify compatibility with your existing 9-inch housing before ordering. Ideal for restoration projects, street rods, drag builds, and reliability-focused modifications where unsprung weight reduction and thermal management matter.
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