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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.
Showing In Stock Items. Show All 771 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, 3.50:1 Gear Ratio, Currie 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
Not Yet Reviewed
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
Estimated Ship Date: 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: Today
Estimated Ship Date: Today
CURRIE SUPER SPORTSMAN THIRD MEMBER - 3.50 GEARS - 31 SPLINE CURRIE TWINTRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9CT350SS50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered 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
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: Today
Estimated Ship Date: 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: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 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: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
5.29 4cyl Spool
Part Number: TGI-140067-1-KIT
Not Yet Reviewed
Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
Third Member Complete Assembly, Assembled 29-Spline Super Finish 3rd Members For Toyota 8" Axles- V6 5.29 ARB
Part Number: TGI-304633-1-KIT
Not Yet Reviewed
Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
5.29, V6, ARB, Polished
Part Number: TGI-301471-1-KIT
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
4.88 V6 Spool 29-Spline
Part Number: TGI-304098-1-KIT
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
NODCASE/WAVETRAC/31/1350PY/NOD/370
Part Number: MSR-3MNW31-AN370
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: 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: Today
Estimated Ship Date: 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: Today
Estimated Ship Date: Today
CURRIE SUPER SPORTSMAN THIRD MEMBER - 3.00 GEARS - 31 SPLINE CURRIE TWINTRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9CT300SS50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
CURRIE SUPER SPORTSMAN THIRD MEMBER - 3.70 GEARS - 31 SPLINE CURRIE TWINTRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9CT370SS50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
CURRIE SUPER SPORTSMAN THIRD MEMBER - 3.70 GEARS - 31 SPLINE CURRIE TWINTRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9CT389SS50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
CURRIE SUPER SPORTSMAN THIRD MEMBER - 4.11 GEARS - 31 SPLINE CURRIE TWINTRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9CT411SS50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
CURRIE PRO THIRD MEMBER - 3.25 GEARS - 35 SPLINE TRUETRAC - ALUMINUM DAYTONA PINION SUPPORT - 1350 CHROMOLY YOKE
Part Number: CUR-CE9TT325R50
Not Yet Reviewed
Estimated Ship Date: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 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: Aug 7, 2025 if ordered today
Estimated Ship Date: Aug 7, 2025 if ordered today
Third Member, Ford 9, 1964-72 A-Body, 31-Spline 3.50
Part Number: OPG-PP06403-350
Not Yet Reviewed
Estimated Ship Date: Oct 13, 2025 if ordered today
Estimated Ship Date: Oct 13, 2025 if ordered today
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