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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.
Showing In Stock Items. Show All 458 Items.
Third Member, 3.70:1 Gear Ratio, Currie TwinTrac, 31-Spline, Nodular Iron Case, Big Bearing Pinion Support, 1350 Yoke, Each
Part Number: CUR-CE-9CT370S50
Estimated Ship Date: Today
Estimated Ship Date: Today
Third Member Complete Assembly, Ford 9 in., 3.50:1 Gear Ratio, TwinTrac, 31-Spline, Nodular Iron Case, Big Bearing Pinion Support, 1350 Yoke, Each
Part Number: CUR-CE-9CT350S50
Estimated Ship Date: Today
Estimated Ship Date: Today
Third Member, 3.89:1 Gear Ratio, Currie TwinTrac, 31-Spline, Nodular Iron Case, Big Bearing Pinion Support, 1350 Yoke, Each
Part Number: CUR-CE-9CT389S50
Estimated Ship Date: Today
Estimated Ship Date: Today
Third Member, 4.11:1 Gear Ratio, Currie TwinTrac, 31-Spline, Nodular Iron Case, Big Bearing Pinion Support, 1350 Yoke, Each
Part Number: CUR-CE-9CT411S50
Estimated Ship Date: Today
Estimated Ship Date: Today
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: Today
Estimated Ship Date: 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: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 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: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
Third Member, Assembled, Toyota 8 in. Case Style, High Pinion, Zip Locker, Cast Iron Case, 5.29:1 Ratio Ring and Pinion, Front, Toyota, Each
Part Number: TGI-301960-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Third Member, Assembled, Toyota 4cyl, 8 inch Rear End, 4.88 Ratio, Detroit Locker
Part Number: TGI-140034-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Third Member, Assembled, Toyota V6 Case Style, Cast Iron Case, 5.29:1 Ratio Ring and Pinion, Toyota, Each
Part Number: TGI-140037-1-KIT
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Third Member, Assembled, Toyota 8 in. Case Style, Cast Iron Case, 5.29:1 Ratio Ring and Pinion, Front, Toyota, Each
Part Number: TGI-140045-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
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: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
9-Inch Third Member Complete Assembly, 3.70 Gear Ratio Spool. 35 Spline, Nodular Iron Case, 1350 Yoke, Each
Part Number: CUR-CE-9SP370R50
Not Yet Reviewed
Estimated Ship Date: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
9-Inch Third Member Complete Assembly, 3.25 Gear Ratio Spool. 35 Spline, Nodular Iron Case, 1350 Yoke, Each
Part Number: CUR-CE-9SP325R50
Not Yet Reviewed
Estimated Ship Date: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
9-Inch Third Member Complete Assembly, 3.50 Gear Ratio Spool. 35 Spline, Nodular Iron Case, 1350 Yoke, Each
Part Number: CUR-CE-9SP350R50
Not Yet Reviewed
Estimated Ship Date: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
9-Inch Third Member Complete Assembly, 3.89 Gear Ratio Spool. 35 Spline, Nodular Iron Case, 1350 Yoke, Each
Part Number: CUR-CE-9SP389R50
Not Yet Reviewed
Estimated Ship Date: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
9-Inch Third Member Complete Assembly, 4.11 Gear Ratio Spool. 35 Spline, Nodular Iron Case, 1350 Yoke, Each
Part Number: CUR-CE-9SP411R50
Not Yet Reviewed
Estimated Ship Date: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 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: Mar 17, 2026 if ordered today
Estimated Ship Date: Mar 17, 2026 if ordered today
4.88 V6 Spool 29-Spline
Part Number: TGI-304098-1-KIT
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
5.29, V6, ARB, Polished
Part Number: TGI-301471-1-KIT
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Ring and Pinion, 4.88 Hi-Pinion 29-Spline Detroit
Part Number: TGI-304511-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Ring and Pinion, 5.29 Hi-Pinion 29-Spline Detroit
Part Number: TGI-304512-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Ring and Pinion, 4.88 Hi-Pinion 29-Spline ARB
Part Number: TGI-304513-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Ring and Pinion, 5.29 Hi-Pinion 29-Spline ARB
Part Number: TGI-304514-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
Ring and Pinion, 4.88 Hi-Pinion 29-Spline Grizzly
Part Number: TGI-304515-1-KIT
Not Yet Reviewed
Estimated Ship Date: Mar 23, 2026 if ordered today
Estimated Ship Date: Mar 23, 2026 if ordered today
