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Transmission & Drivetrain

Performance & Replacement Transmission & Drivetrain Parts

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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.

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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Results 1 - 25 of 2000 +

Advance Adapters Saturn Overdrive Units 915672

Made in the USA 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: Apr 6, 2026 if ordered today

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Estimated Ship Date: Apr 6, 2026 if ordered today

Advance Adapters Saturn Overdrive Units for 1959-1960 CJ3, 1961-1965 SCOUT - 915670

Made in the USA Advance Adapters Saturn Overdrive Units for 1959-1960 CJ3, 1961-1965 SCOUT - 915670

Advance Adapters Saturn Overdrive Units for 1959-1960 CJ3, 1961-1965 SCOUT - 915670

Overdrive Unit, Jeep, International, 134/152, L4, Each

Part Number: ADD-915670

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Advance Adapters Saturn Overdrive Units 915676

Made in the USA Advance Adapters Saturn Overdrive Units 915676

Advance Adapters Saturn Overdrive Units 915676

Overdrive Unit, Saturn, 10 Internal Gear Teeth, 31 External Drive Gear Teeth, Each

Part Number: ADD-915676

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-JKAD

Made in the USA Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-JKAD

Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-JKAD

RubiCrawler, NV241 Transfer Case, Twin Stick Shifter, With Heavy Duty Cable Upgrade, Jeep, Each

Part Number: ADD-RUBI-JKAD

Not Yet Reviewed

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Advance Adapters RubiCrawler Crawl Gearboxes for 1997-2006 WRANGLER - RUBI-TJ

Made in the USA Advance Adapters RubiCrawler Crawl Gearboxes for 1997-2006 WRANGLER - RUBI-TJ

Advance Adapters RubiCrawler Crawl Gearboxes for 1997-2006 WRANGLER - RUBI-TJ

RubiCrawler, NV231 Transfer Case, Twin Stick Shifter, Jeep, Wrangler, Each

Part Number: ADD-RUBI-TJ

Not Yet Reviewed

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-UNIV

Made in the USA Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-UNIV

Advance Adapters RubiCrawler Crawl Gearboxes for 2003-2011 WRANGLER - RUBI-UNIV

RubiCrawler, Atlas or Aftermarket Transfer Case, Universal Stick Shifter, Jeep, Wrangler, Each

Part Number: ADD-RUBI-UNIV

Not Yet Reviewed

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Advance Adapters Overdrive Units 915677

Made in the USA Advance Adapters Overdrive Units 915677

Advance Adapters Overdrive Units 915677

***OVERDRIVE, MINUS BOWL GEAR

Part Number: ADD-915677

Not Yet Reviewed

Estimated Ship Date: May 28, 2026 if ordered today

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Estimated Ship Date: May 28, 2026 if ordered today

Sierra Marine Shift Cable Bellows 18-2742

Sierra Marine Shift Cable Bellows 18-2742

Sierra Marine Shift Cable Bellows 18-2742

Marine Drive Unit Components, Shift Shaft Boot, Each

Part Number: RRA-18-2742

Not Yet Reviewed

Estimated Ship Date: May 8, 2026 if ordered today

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Estimated Ship Date: May 8, 2026 if ordered today

Sierra Marine Drive Unit Caps 18-2382

Sierra Marine Drive Unit Caps 18-2382

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: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Advance Adapters Saturn Overdrive Components 911236

Made in the USA Advance Adapters Saturn Overdrive Components 911236

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 Transom Seal Kits 18-8206-1

Sierra Marine Transom Seal Kits 18-8206-1

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: May 11, 2026 if ordered today

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Estimated Ship Date: May 11, 2026 if ordered today

Sierra Marine Lower Unit Seal Kits 18-2698

Sierra Marine Lower Unit Seal Kits 18-2698

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: May 8, 2026 if ordered today

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Estimated Ship Date: May 8, 2026 if ordered today

Sierra Marine Rope Seal Gaskets 18-2534

Sierra Marine Rope Seal Gaskets 18-2534

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: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Lower Unit Fill Tubes 18-2448

Sierra Marine Lower Unit Fill Tubes 18-2448

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: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Lower Unit Seal Kits 18-8360

Sierra Marine Lower Unit Seal Kits 18-8360

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: May 8, 2026 if ordered today

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Estimated Ship Date: May 8, 2026 if ordered today

Sierra Marine Gear Kits 18-1293

Sierra Marine Gear Kits 18-1293

Sierra Marine Gear Kits 18-1293

Marine Drive Unit Components, Gear Set, Kit

Part Number: RRA-18-1293

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Bearing Carriers 18-2370

Sierra Marine Bearing Carriers 18-2370

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: May 11, 2026 if ordered today

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Estimated Ship Date: May 11, 2026 if ordered today

Sierra Marine U-Joint Assemblies 18-9218

Sierra Marine U-Joint Assemblies 18-9218

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 Bushings 18-2622

Sierra Marine Bushings 18-2622

Sierra Marine Bushings 18-2622

Marine Drive Unit Components, Bell Housing Bushing, Kit

Part Number: RRA-18-2622

Not Yet Reviewed

Estimated Ship Date: May 11, 2026 if ordered today

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Estimated Ship Date: May 11, 2026 if ordered today

Sierra Marine Pinion Nuts 18-3719

Sierra Marine Pinion Nuts 18-3719

Sierra Marine Pinion Nuts 18-3719

Marine Drive Unit Components, Pinion Nut, Each

Part Number: RRA-18-3719

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

Sierra Marine Trim Cylinder Kits 18-6752

Sierra Marine Trim Cylinder Kits 18-6752

Sierra Marine Trim Cylinder Kits 18-6752

Marine Drive Unit Components, Hydraulic Trim Pump Assembly, Metal Bracket, Kit

Part Number: RRA-18-6752

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Drive Shimming Tools 18-2282

Sierra Marine Drive Shimming Tools 18-2282

Sierra Marine Drive Shimming Tools 18-2282

Marine Drive Unit Components, Shim, Kit

Part Number: RRA-18-2282

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Retaining Rings 18-4289-9

Sierra Marine Retaining Rings 18-4289-9

Sierra Marine Retaining Rings 18-4289-9

Marine Drive Unit Components, Retaining Ring, Pair

Part Number: RRA-18-4289-9

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Gear Kits 18-2402

Sierra Marine Gear Kits 18-2402

Sierra Marine Gear Kits 18-2402

Marine Drive Unit Components, Lower Gear Housing, Each

Part Number: RRA-18-2402

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today

Sierra Marine Clutch Dogs 18-1290

Sierra Marine Clutch Dogs 18-1290

Sierra Marine Clutch Dogs 18-1290

Marine Drive Unit Components, Clutch Dog, Each

Part Number: RRA-18-1290

Not Yet Reviewed

Estimated Ship Date: May 13, 2026 if ordered today

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Estimated Ship Date: May 13, 2026 if ordered today