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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.

Individual Parts

Results 1 - 25 of 2000 +

Shift Kit, Zip Kit, Chevy, Kit

Part Number: SOX-6L45-6L90ZIP

5.0 out of 5 stars ( 4 )

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Shift Kit, Automatic Type, GM, 4L80E, 4L85E, Forward/Standard Shift Pattern, Each

Part Number: TRG-4L80E-HD2

4.62 out of 5 stars ( 55 )

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Shift Kit, Automatic Type, Includes .500 in. Boost Valve, GM, 4L60E, Each

Part Number: TRG-4L60E-HD2

4.75 out of 5 stars ( 59 )

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Shift Improver Performance Pack, 4L60E, 4L65E, 4L70E, Buick, Chevy, GMC, Oldsmobile, Pontiac, Kit

Part Number: SOX-HP-4L60E-01

5.0 out of 5 stars ( 4 )

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Automatic Shift Kit, 6L80, 6L80E, 6L90, 6L90E, Cadillac, Chevrolet, GMC, Hummer, Pontiac, Kit

Part Number: TRG-SK6L80

5.0 out of 5 stars ( 1 )

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Shift Kit, Performance, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH350, 1969-81, Kit

Part Number: TRG-350-1-2

4.41 out of 5 stars ( 56 )

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Shift Kit, Performance, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH400, 1965-95, Kit

Part Number: TRG-400-1-2

4.76 out of 5 stars ( 21 )

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Shift Kit, Performance, Gaskets, Pro-Race, Heavy Duty, Super Show Off, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, TH400, Kit

Part Number: TRG-400-PRO

4.95 out of 5 stars ( 21 )

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Automatic Transmission Valve Body, GM 4L80-E, 4L85-E, Performance, Each

Part Number: SOX-HP-4L80E-01

Not Yet Reviewed

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Automatic Transmission Shift Kits, Reprogramming Kit, Performance/Tow/Haul, GM, 6L45, 6L50, 6L80, 6L90, Kit

Part Number: TRG-6L80-TOW-PRO

5.0 out of 5 stars ( 2 )

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Automatic Transmission Shift Kits, TCC Zip Kit, with O-Ring End Plugs, Converter Limit Valve, Regulator/Shuttle, Cadillac, Chevy, GMC, 8L45, 8L90, Kit

Part Number: SOX-8L458L90TCCZ

Not Yet Reviewed

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Shift Kit, Automatic, Full Manual, GM, 700R4, Towing, Competition, Pro Sreet, Each

Part Number: TRG-700-2-3

4.32 out of 5 stars ( 25 )

Estimated Ship Date: Tomorrow

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Shift Kit, Shift Improvement, ISO-CON Valve, GM, 4L60E, 4L65E, 4L70E, 4L75E, Each

Part Number: TRG-SK4L60E

5.0 out of 5 stars ( 6 )

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Shift Improver, Chevy, TH350, Each

Part Number: BMM-30262

4.72 out of 5 stars ( 25 )

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Shift Kit, Automatic Type, Chrysler, Torqueflite, 3 Speed, Full Race Shifts, Each

Part Number: TRG-TF-2

4.77 out of 5 stars ( 26 )

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Shift Kit, Automatic Type, Ford, AODE, 4R70W, Towing, Competition, Heavy Duty, Pro-Street, Each

Part Number: TRG-AODE-HD2

4.71 out of 5 stars ( 21 )

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Performance Shift Kit, 4L60E, 4L65E, 4L70E, Kit

Part Number: TRG-4L60E-PRO

5.0 out of 5 stars ( 4 )

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Automatic Transmission Shift Kits, Chrysler, 45RFE, 545RFE, 65RFE, 66RFE, 68RFE, Kit

Part Number: TRG-RFE-5B-HP

Not Yet Reviewed

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Shift Kit, Full Manual, Chrysler, Full Race, Competition, Off Road, Pro Street, Each

Part Number: TRG-TFOD-3

5.0 out of 5 stars ( 5 )

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Shift Kit, Automatic Type, Infiniti, for Nissan, Jatco, 5-Speed, Kit

Part Number: TRG-RE5R05A-HD2

4.88 out of 5 stars ( 8 )

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Automatic Transmission Shift Kits, Zip Kit, with Boost Valve, O-Ring Plugs, Accumulator Pistons, Spring, Sleeves, Ford, 6R140, Kit

Part Number: SOX-6R140-ZIP

Not Yet Reviewed

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Shift Kit, Automatic Type, Ford, C-6, Towing, Competition, Heavy Duty, Gas Engines, Each

Part Number: TRG-67-1-2

4.82 out of 5 stars ( 17 )

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Automatic Transmission Shift Kit, Gaskets, Jeep, Toyota, Kit

Part Number: TRG-340-HD2

5.0 out of 5 stars ( 12 )

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Shift Kit, Shift Improvement, without Auxiliary Valve Body, GM, 700R4, 4L60, Each

Part Number: TRG-SK700

4.0 out of 5 stars ( 4 )

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Transmission Upgrade Kit, Shift Improver, GM, TH400, TH375, M40, Each

Part Number: BMM-20260

4.81 out of 5 stars ( 16 )

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