Description
Comparison points and tradeoffs
When comparing Posi Differential 3rd Member, 28 Spl, 3.89 Gear Ratio, Fits Ford 9 Inch with other Differential Assembly Kits options, use this source-backed detail as the primary discriminator: Tough, Nodular Iron Center Section OurCompatible with Ford 9 Inch Nodular Iron Third Member Center Section Carrier starts with a NEW casting with over 4 lbs. of additional material in critical areas.
Use this second fact to evaluate the tradeoff: Model: Speedway Motors. A third point to compare across alternatives is: Thick, forged steel bearing caps surround the carrier bearings, all securely held in place with precision Grade 8 cap screws.
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
| Manufacturer | Speedway Motors |
|---|---|
| Brand | Speedway Motors |
| Model | Speedway Motors |
| Item Weight | 89 pounds |
| Product Dimensions | 18 x 14.3 x 13.4 inches |
| Manufacturer Part Number | 91049345-28-389 |
As featured on Classic Truck’s Week to Wicked. Watch the transformation here! Assembled by Professionals Hand-assembled by trained experts in-house, ourCompatible with Ford 9-inch third members are built from quality components with an exact step-by-step process. We bring this combination of precision assembly and quality components to you at a price that can’t be beat. We trust these third members so much, they’re the go-to choice for our own rides, from the street to the track. Tough, Nodular Iron Center Section OurCompatible with Ford 9 Inch Nodular Iron Third Member Center Section Carrier starts with a NEW casting with over 4 lbs. of additional material in critical areas. Nodular (ductile) iron is much more resistant to fracturing than OEM “gray” iron. Extra ribbing reinforces the case and rearmost pinion support (pilot bearing). Thick, forged steel bearing caps surround the carrier bearings, all securely held in place with precision Grade 8 cap screws. The improvements continue with rugged billet steel adjuster nuts and heavy-duty keepers to ensure your ring gear settings are maintained. All mounting surfaces are precision machined to ensure a consistent, flat surface for a positive gasket seal (no more leaks on your shop floor). An oil fill plug is included. Precision Assembled for Proper Ring Gear Teeth Pattern Getting a proper pattern on the ring gear teeth is crucial. Our time-proven, step-by-step process ensures the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth. Our gears use cold-rolled 8620 steel, known for its long-wear and durability. To ensure a proper gear pattern, we use a stronger “Daytona” style pinion bearing support to maintain that critical pinion depth setting
Source product highlights
- Hand-assembled by our trained technicians for an unbeatable combination of quality and value
- Precision assembly for the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth on all of our Compatible with Ford 9 inch limited slip differentials
- 9 inch Compatible with Ford posi units are ideal for street tires and medium horsepower applications
- Nodular iron housing is stronger than OEM “gray” iron and has 4 lbs of additional reinforcement
- Clutch style positraction differential gives limited slip performance and quiet operation (no gears clicking!)
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