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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.

Individual Parts

Results 1 - 25 of 84

Complete Third Member, 4.11:1 Gear Ratio, Detroit TrueTrac, 35-Spline, Nodular Iron Race Case, Aluminum Big Bearing Pinion Support, 1350 Yoke, Each

Part Number: CUR-CE-9TT411R50

Not Yet Reviewed

Estimated Ship Date: Jan 8, 2026 if ordered today

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Estimated Ship Date: Jan 8, 2026 if ordered today

Complete Third Member, 3.50:1 Gear Ratio, Detroit TrueTrac, 35-Spline, Nodular Iron Race Case, Aluminum Big Bearing Pinion Support, 1350 Yoke, Each

Part Number: CUR-CE-9TT350R50

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 if ordered today

Complete Third Member, 3.70:1 Gear Ratio, Detroit TrueTrac, 35-Spline, Nodular Iron Race Case, Aluminum Big Bearing Pinion Support, 1350 Yoke, Each

Part Number: CUR-CE-9TT370R50

Not Yet Reviewed

Estimated Ship Date: Jan 8, 2026 if ordered today

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Estimated Ship Date: Jan 8, 2026 if ordered today

CURRIE PRO THIRD MEMBER - 3.25 GEARS - 35 SPLINE TRUETRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE

Part Number: CUR-CE9TT325R50

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Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 if ordered today

Complete Third Member, 3.00:1 Gear Ratio, Detroit TrueTrac, 35-Spline, Nodular Iron Race Case, Aluminum Big Bearing Pinion Support, 1350 Yoke, Each

Part Number: CUR-CE-9TT300R50

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 if ordered today

Third Member Complete Assembly, Detroit Speed, FN988 Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.73 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

Part Number: DSR-070880-373DS

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Third Member Complete Assembly, Detroit Speed, FN988 Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.31 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

Part Number: DSR-070880-331DS

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

Third Member Complete Assembly, Detroit Speed, FN988 Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.08 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

Part Number: DSR-070880-308DS

Not Yet Reviewed

Estimated Ship Date: Jan 2, 2026 if ordered today

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Estimated Ship Date: Jan 2, 2026 if ordered today

Third Member Complete Assembly, Detroit Speed, FN988 Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.55 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

Part Number: DSR-070880-355DS

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

Third Member Complete Assembly, Detroit Speed, FN988 Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 4.10 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

Part Number: DSR-070880-410DS

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

Complete Third Member, 3.89:1 Gear Ratio, Detroit TrueTrac, 35-Spline, Nodular Iron Race Case, Aluminum Big Bearing Pinion Support, 1350 Yoke, Each

Part Number: CUR-CE-9TT389R50

Not Yet Reviewed

Estimated Ship Date: Jan 9, 2026 if ordered today

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Estimated Ship Date: Jan 9, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron Case, Truetrac, 35-Spline, Daytona Pro/Street Support, 3.70:1, Each

Part Number: MSR-3MNT35AA370

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 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: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 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: Jan 13, 2026 if ordered today

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Estimated Ship Date: Jan 13, 2026 if ordered today

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: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 4.11:1 Ratio, Kit

Part Number: MSR-3MNT31AN411

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Third Member Assembly, Ford 9 in., Nodular Iron Case, Detroit Truetrac, 31-Spline Axle, 3.00:1 Ratio, Each

Part Number: MSR-3MNT31BN300

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 3.89:1 Ratio, Each

Part Number: MSR-3MNT31BN389

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 4.11:1 Ratio, Each

Part Number: MSR-3MNT31BN411

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Center Section, 9 in. Ford, Aluminum Case, Truetrac, 31-Spline, Daytona Pro/Street Pinion Support, 3.50:1

Part Number: MSR-3MAT31AA350

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 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: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 3.50:1 Ratio, Each

Part Number: MSR-3MNT31BN350

Not Yet Reviewed

Estimated Ship Date: Jan 19, 2026 if ordered today

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Estimated Ship Date: Jan 19, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 28-Spline Axle, 4.11:1 Ratio, Each

Part Number: MSR-3MNT28AN411

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 4.11:1 Ratio, Each

Part Number: MSR-3MNT31-AA411

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Center Section, 9 in. Ford, Nodular Iron, Detroit Truetrac, 31-Spline Axle, 3.50:1 Ratio, Each

Part Number: MSR-3MNT31BA350

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

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