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Complete Third Member and Center Sections
Instead of piecing one together and hoping it all fits, get a complete third member assembly with one part number from Summit Racing Equipment!
A complete third member...
Instead of piecing one together and hoping it all fits, get a complete third member assembly with one part number from Summit Racing Equipment!
A complete third member assembly (sometimes called a center section) includes everything you need to connect your driveshaft to your rear axles. They typically include a U-joint style yoke to connect to your driveshaft, ring and pinion gears, differential carrier, and a case. They’re also available with spools for maximum traction.
Whether you need a lightweight center section for racing, a trail-tough third member assembly for off-roading, or a stock replacement for fixing up your...
Instead of piecing one together and hoping it all fits, get a complete third member assembly with one part number from Summit Racing Equipment!
A complete third member assembly (sometimes called a center section) includes everything you need to connect your driveshaft to your rear axles. They typically include a U-joint style yoke to connect to your driveshaft, ring and pinion gears, differential carrier, and a case. They’re also available with spools for maximum traction.
Whether you need a lightweight center section for racing, a trail-tough third member assembly for off-roading, or a stock replacement for fixing up your daily driver, our search tools make it easy to find the right third member assembly! For example, if you’re your looking for a Ford 9 inch third member, you can filter by case style (Ford, Chevy, Toyota, etc.), axle spline count, gear ratio, and more! With hundreds of applications available, Summit is your go-to source for complete third member assemblies.
Differential Identification Charts
Not sure what you’ve got back there? Visit Summit’s Help Center for our rear-end identification guides.
Even More Complete!
Need the matching axles, too? Consider a complete rear end assembly!
Top Brands
No third party resellers here—Summit Racing only partners with trusted manufacturers like Moser, Strange Engineering, Trail Gear, and Currie Enterprises.
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.11:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AT411P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 40-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.29:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS40AT429P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 3.25:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AA325
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 4.86:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS31AP486P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., Nodular Iron Case, Steel Main Cap, Bolt Retention, 5.14:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AA514
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 4.11:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS31AN411
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.89:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AA389
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 3.00:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AA300
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.11:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS40AP411P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 4.57:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS31AP457P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 4.57:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AN457
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.50:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AA350
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 33-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.89:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS33AN389
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 40-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.50:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS40AA350
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.50:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AN350
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.25:1 Ratio, 1310 Series Yoke, Each
Part Number: MSR-3MNS35BN325
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 3.89:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AP389P
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.11:1 Ratio, 1310 Series Yoke, Each
Part Number: MSR-3MAS35BA411
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.11:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35DA411
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 4.11:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AP411P
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 31-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 5.14:1 Ratio, 1310 Series Yoke, Each
Part Number: MSR-3MAS31BA514
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.50:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS35AP350P
Not Yet Reviewed
Estimated Ship Date: May 27, 2026 if ordered today
Estimated Ship Date: May 27, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 35-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 5.14:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS35AA514P
Not Yet Reviewed
Estimated Ship Date: Jun 2, 2026 if ordered today
Estimated Ship Date: Jun 2, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 33-Spline, Aluminum Case, Aluminum Main Cap, Bolt Retention, 5.43:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MAS33AA543P
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Steel Main Cap, Bolt Retention, 3.25:1 Ratio, 1350 Series Yoke, Each
Part Number: MSR-3MNS31AA325
Not Yet Reviewed
Estimated Ship Date: Jun 3, 2026 if ordered today
Estimated Ship Date: Jun 3, 2026 if ordered today
