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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.
Center Section, 9 in. Ford, Nodular Iron, Trak-Lok, 31-Spline Axle, 3.70:1 Ratio, Each
Part Number: MSR-3MNC31AN370
Not Yet Reviewed
Estimated Ship Date: Monday 7/14/2025
Estimated Ship Date: Monday 7/14/2025
Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 3.50:1 Ratio, Kit
Part Number: MSR-3MNT31AN350
Not Yet Reviewed
Estimated Ship Date: Monday 7/14/2025
Estimated Ship Date: Monday 7/14/2025
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: Monday 7/14/2025
Estimated Ship Date: Monday 7/14/2025
Center Section, 9 in. Ford, Nodular Iron, Locker, 35-Spline Axle, 3.50:1 Ratio, Each
Part Number: MSR-3MNL35AA350
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Aluminum Case, Spool, 35-Spline Axle, Daytona Pinion Support, 4.11:1 Ratio, Each
Part Number: MSR-3MAS35AA411
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Cast Iron, Trak-Lok, 31-Spline Axle, 3.25:1 Ratio, Each
Part Number: MSR-3MSC31AN325
Not Yet Reviewed
Estimated Ship Date: Aug 4, 2025 if ordered today
Estimated Ship Date: Aug 4, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 40-Spline Axle, 5.29:1 Ratio, Each
Part Number: MSR-3MNS40-AA529
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 4.11:1 Ratio, Each
Part Number: MSR-3MNS31AA411
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Aluminum, Detroit Truetrac, 31-Spline Axle, 3.70:1 Ratio, Each
Part Number: MSR-3MAT31AA370
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 35-Spline Axle, 4.11:1 Ratio, Each
Part Number: MSR-3MNS35AN411
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Third Member Assembly, Ford 9 in., Nodular Iron Case, Detroit Truetrac, 35-Spline Axle, 3.50:1 Ratio, Each
Part Number: MSR-3MNT35AA350
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Aluminum, Detroit Truetrac, 31-Spline Axle, 4.11:1 Ratio, Each
Part Number: MSR-3MAT31BA411
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 35-Spline Axle, 4.57:1 Ratio, Each
Part Number: MSR-3MNS35AP457P
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Aluminum Case, Spool, 35-Spline Axle, Pro 10-Hole Support, 4.86:1 Ratio, Each
Part Number: MSR-3MAS35AT486P
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Cast Iron, Trak-Lok, 28-Spline Axle, 3.89:1 Ratio, Each
Part Number: MSR-3MSC28AN389
Not Yet Reviewed
Estimated Ship Date: Aug 20, 2025 if ordered today
Estimated Ship Date: Aug 20, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Auburn Limited Slip, 31-Spline Axle, 3.25:1 Ratio, Each
Part Number: MSR-3MNA31AA325
Not Yet Reviewed
Estimated Ship Date: Aug 11, 2025 if ordered today
Estimated Ship Date: Aug 11, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 3.50:1 Ratio, Each
Part Number: MSR-3MNS31AA350
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 3.89:1 Ratio, Each
Part Number: MSR-3MNS31AA389
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Third Member Assembly, Ford 9 in., Nodular Iron Case, Spool, 31-Spline Axle, 4.57:1 Ratio, Each
Part Number: MSR-3MNS31AN457
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 4.86:1 Ratio, Each
Part Number: MSR-3MNS31AN486
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 5.43:1 Ratio, Each
Part Number: MSR-3MNS31AN543
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 5.67:1 Ratio, Each
Part Number: MSR-3MNS31AN567
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 5.83:1 Ratio, Each
Part Number: MSR-3MNS31AN583
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 6.00:1 Ratio, Each
Part Number: MSR-3MNS31AN600
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
Center Section, 9 in. Ford, Nodular Iron, Spool, 31-Spline Axle, 6.20:1 Ratio, Each
Part Number: MSR-3MNS31AN620
Not Yet Reviewed
Estimated Ship Date: Aug 1, 2025 if ordered today
Estimated Ship Date: Aug 1, 2025 if ordered today
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