Performance & Replacement Transmission & Drivetrain Parts

Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic...

Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.

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Advance Adapters Saturn Overdrive Units 915672

Advance Adapters Saturn Overdrive Units 915672

Overdrive Unit, Saturn, 3-Speed, Each

Part Number: ADD-915672

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Sierra Marine Lower Unit Fill Tubes 18-2448

Marine Drive Unit Components, Lower Unit Fill, Drain Kit, Kit

Part Number: RRA-18-2448

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

Sierra Marine Drive Unit Caps 18-2382

Marine Drive Unit Components, Upper Drive Unit Cap, Each

Part Number: RRA-18-2382

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

Sierra Marine Lower Unit Seal Kits 18-2698

Marine Drive Unit Components, Clutch Housing Seal Kit, Kit

Part Number: RRA-18-2698

5.0 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

Sierra Marine Lower Unit Seal Kits 18-8360

Marine Drive Unit Components, Clutch Housing Seal Kit, Each

Part Number: RRA-18-8360

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

Sierra Marine Driveshaft Housing Gaskets 18-2713

Marine Drive Unit Components, Drive Shaft Housing Gasket, Mercury Marine, Each

Part Number: RRA-18-2713

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

Sierra Marine U-Joint Assemblies 18-9218

Marine Drive Unit Components, U-Joint Assembly, Each

Part Number: RRA-18-9218

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

Sierra Marine Pinion Nuts 18-3719

Marine Drive Unit Components, Pinion Nut, Each

Part Number: RRA-18-3719

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

Sierra Marine Anchor Screws 18-3725-9

Marine Drive Unit Components, Ball Gear Nut, Set of 5

Part Number: RRA-18-3725-9

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

Sierra Marine Pinion Nuts 18-3769

Marine Drive Unit Components, Pinion Nut, Each

Part Number: RRA-18-3769

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

Sierra Marine Drive Shimming Tools 18-2282

Marine Drive Unit Components, Shim, Kit

Part Number: RRA-18-2282

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

Sierra Marine Drive Shimming Tools 18-2283

Marine Drive Unit Components, Shim, Kit

Part Number: RRA-18-2283

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

Sierra Marine Drive Shimming Tools 18-2285

Marine Drive Unit Components, Shim, Kit

Part Number: RRA-18-2285

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

Sierra Marine Drive Shimming Tools 18-2232

Marine Drive Unit Components, Shim, 1.22 in. Diameter, 0.003 in. Thick, Each

Part Number: RRA-18-2232

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

Sierra Marine Shafts 18-73131

Marine Drive Unit Components, Gimbal Ring Shaft, Each

Part Number: RRA-18-73131

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

Sierra Marine Drive Shimming Tools 18-2296

Marine Drive Unit Components, Shim, 0.055 in. Thick, Each

Part Number: RRA-18-2296

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

Sierra Marine Bearing Carrier Retainer Tools 18-02061

Marine Drive Unit Components, Shim, Bearing Carrier Shim, 0.010 in. Thick, Brown, Each

Part Number: RRA-18-02061

5.0 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

Sierra Marine Prop Shafts 18-2166

Marine Drive Unit Components, Prop Shaft, Each

Part Number: RRA-18-2166

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

Sierra Marine Transom Seal Kits 18-8206-1

Marine Drive Unit Components, Transom Seal Kit, Mercruiser Stern Drive, Kit

Part Number: RRA-18-8206-1

Not Yet Reviewed

Estimated Ship Date: Dec 23, 2025 if ordered today

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Estimated Ship Date: Dec 23, 2025 if ordered today

Advance Adapters Saturn Overdrive Components 911236

Retainer, Overdrive Unit Replacement Component, Saturn, Dana 18, Each

Part Number: ADD-911236

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

Sierra Marine Rope Seal Gaskets 18-2534

Marine Drive Unit Components, Lower Unit Rope Seal, 40.00 in. Length, Chrysler, Force, US Marine, Johnson/Evinrude, Each

Part Number: RRA-18-2534

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

Sierra Marine Bearing Carriers 18-2370

Marine Drive Unit Components, Bearing Carrier, Chrysler/Force/Marine, Mercury Marine, Each

Part Number: RRA-18-2370

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

Sierra Marine Upper Gear Kits 18-6352

Marine Drive Unit Components, Upper Gears, Kit

Part Number: RRA-18-6352

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

Sierra Marine Drain Plugs 18-23871-9

Marine Drive Unit Components, Lower Unit Drain, Fill Screw, Set of 50

Part Number: RRA-18-23871-9

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

Sierra Marine Gear Kits 18-2204

Marine Drive Unit Components, Gear Set, Upper Unit, Kit

Part Number: RRA-18-2204

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

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