Summit Racing SpeedCard - learn how to get 10% back up to $100

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Summit Racing SpeedCard - learn how to get 10% back up to $100

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Third Member Complete Assembly
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Complete Third Member and Center Sections

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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.

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Results 1 - 25 of 288

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN370

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN370

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN370

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Yukon Trak-Lok, 3.70:1 Ratio, Daytona Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MNC31AN370

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moser Engineering Ford 9 in. Third Member Assemblies 3MST31AN350

Moser Engineering Ford 9 in. Third Member Assemblies 3MST31AN350

Moser Engineering Ford 9 in. Third Member Assemblies 3MST31AN350

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Detroit Truetrac, 3.50:1 Ratio, Daytona Pinion Support,1350 Series Yoke,Each

Part Number: MSR-3MST31AN350

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MSC31AN325

Moser Engineering Ford 9 in. Third Member Assemblies 3MSC31AN325

Moser Engineering Ford 9 in. Third Member Assemblies 3MSC31AN325

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Trak-Lok, 3.25:1 Ratio, Daytona Pinion Support,1350 Series Yoke, Each

Part Number: MSR-3MSC31AN325

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35CP457P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35CP457P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35CP457P

Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Spool, 4.57:1 Ratio, Daytona Pinion Support, Pinion Coupler Yoke, Each

Part Number: MSR-3MNS35CP457P

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31BN389

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31BN389

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31BN389

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Detroit Truetrac, 3.89:1 Ratio, Daytona Pinion Support,1310 Series Yoke,Each

Part Number: MSR-3MNT31BN389

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS28AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS28AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS28AA411

Third Member Complete Assembly, Ford 9 in., 28-Spline, Nodular Iron Case, Spool, 4.11:1 Ratio, Daytona Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MNS28AA411

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT350P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT350P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT350P

Third Member Complete Assembly, Ford 9 in., 40-Spline, Aluminum Case, Spool, 3.50:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS40AT350P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS33AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS33AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS33AP429P

Third Member Complete Assembly, Ford 9 in., 33-Spline, Nodular Iron Case, Spool, 4.29:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNS33AP429P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN300

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN300

Moser Engineering Ford 9 in. Third Member Assemblies 3MNC31AN300

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Yukon Trak-Lok, 3.00:1 Ratio, Daytona Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MNC31AN300

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN411

Third Member Complete Assembly, Ford 9 in., 28-Spline, Nodular Case, Detroit Truetrac, 4.11:1 Ratio, Daytona Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNT28AN411

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN370

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN370

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT28AN370

Third Member Complete Assembly, Ford 9 in., 28-Spline, Nodular Case, Detroit Truetrac, 3.70:1 Ratio, Daytona Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNT28AN370

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAA31AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MAA31AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MAA31AA411

Third Member Complete Assembly, Ford 9 in., 31-Spline, Aluminum Case, Auburn Limited Slip, 4.11:1 Ratio, Daytona Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAA31AA411

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT486P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT486P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT486P

Third Member Complete Assembly, Ford 9 in., 40-Spline, Aluminum Case, Spool, 4.86:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS40AT486P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Moser Engineering Ford 9 in. Third Member Assemblies 3MAL31BA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MAL31BA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MAL31BA411

Third Member Complete Assembly, Ford 9 in., 31-Spline, Aluminum Case, Locker, 4.11:1 Ratio, Daytona Pinion Support, 1310 Series Yoke,Each

Part Number: MSR-3MAL31BA411

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA411

Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Spool, 4.11:1 Ratio, Daytona Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNS35AA411

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AP429P

Third Member Complete Assembly, Ford 9 in., 33-Spline, Aluminum Case, Spool, 4.29:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS33AP429P

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AT486P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AT486P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS33AT486P

Third Member Complete Assembly, Ford 9 in., 33-Spline, Aluminum Case, Spool, 4.86:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS33AT486P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40-AA529

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40-AA529

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40-AA529

Third Member Complete Assembly, Ford 9 in., 40-Spline, Nodular Iron Case, Spool, 5.29:1 Ratio, Daytona Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNS40-AA529

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS31AA325

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS31AA325

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS31AA325

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Spool, 3.25:1 Ratio, Daytona Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MNS31AA325

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40AP457P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40AP457P

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS40AP457P

Third Member Complete Assembly, Ford 9 in., 40-Spline, Nodular Iron Case, Spool, 4.57:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNS40AP457P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA543

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA543

Moser Engineering Ford 9 in. Third Member Assemblies 3MNS35AA543

Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Spool, 5.43:1 Ratio, Daytona Pinion Support, 1350 Series Yoke, Each

Part Number: MSR-3MNS35AA543

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31-AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31-AA411

Moser Engineering Ford 9 in. Third Member Assemblies 3MNT31-AA411

Third Member Complete Assembly, Ford 9 in., 31-Spline, Nodular Iron Case, Detroit Truetrac, 4.11:1 Ratio, Daytona Pinion Support,1350 Series Yoke,Each

Part Number: MSR-3MNT31-AA411

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MNW35AA389

Moser Engineering Ford 9 in. Third Member Assemblies 3MNW35AA389

Moser Engineering Ford 9 in. Third Member Assemblies 3MNW35AA389

Third Member Complete Assembly, Ford 9 in., 35-Spline, Nodular Iron Case, Wavetrac, 3.89:1 Ratio, Daytona Pinion Support,1350 Series Yoke, Each

Part Number: MSR-3MNW35AA389

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AP429P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AP429P

Third Member Complete Assembly, Ford 9 in., 40-Spline, Aluminum Case, Spool, 4.29:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS40AP429P

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

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Estimated Ship Date: Dec 7, 2026 if ordered today

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT411P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT411P

Moser Engineering Ford 9 in. Third Member Assemblies 3MAS40AT411P

Third Member Complete Assembly, Ford 9 in., 40-Spline, Aluminum Case, Spool, 4.11:1 Ratio, 10-Hole Pro Pinion Support, 1350 Series Yoke,Each

Part Number: MSR-3MAS40AT411P

Not Yet Reviewed

Estimated Ship Date: Dec 8, 2026 if ordered today

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Estimated Ship Date: Dec 8, 2026 if ordered today

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