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.

Individual Parts

Part Groups

Results 1 - 25 of 2000 +

4x4 Posi-Lok Positive Axle Engagement Systems for 1994-2002 RAM 3500, RAM 2500, 1994-2001 RAM 1500 - 400

Front Axle Actuator, Posi-Lok, Dodge, Pickup, Kit

Part Number: POS-400

4.7 out of 5 stars ( 147 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Positive Axle Engagement Systems 500

Front Axle Actuator, Posi-Lok, Chevy, GMC, 4WD, Kit

Part Number: POS-500

4.06 out of 5 stars ( 34 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Positive Axle Engagement Systems for 1997-2003 F-150, 2004 F-150 HERITAGE - 750

Front Axle Actuator, Posi-Lok, Ford, Kit

Part Number: POS-750

4.84 out of 5 stars ( 25 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Positive Axle Engagement Systems 450

Front Axle Actuator, Posi-Lok, Dodge, Kit

Part Number: POS-450

4.47 out of 5 stars ( 30 )

Estimated Ship Date: Tomorrow

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RT Off-Road Mechanical Axle Engagement Systems for 1984-1993 CHEROKEE, 1986-1992 COMANCHE, 1987-1995 WRANGLER - RT23003

RT Off-Road Mechanical Axle Engagement Systems for 1984-1993 CHEROKEE, 1986-1992 COMANCHE, 1987-1995 WRANGLER - RT23003

Front Axle Engagement System, Mechanical, Dana 30, Jeep, Kit

Part Number: RTO-RT23003

3.6 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Perm-Lok Systems 1000

"Perm-Lok" - Positive Axle Engagement System

Part Number: POS-1000

4.5 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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RT Off-Road Mechanical Axle Engagement Systems for 1984-1993 CHEROKEE, 1986-1992 COMANCHE, 1987-1995 WRANGLER - RT23002

Front Axle Engagement System, Mechanical, Dana 30, Jeep, Kit

Part Number: RTO-RT23002

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Front Axle Engagement Replacement Parts 100

Central Axle Disconnect Fork, Upgrade, Dodge, Jeep, W-Series, Pickup, Trailduster, Each

Part Number: POS-100

4.69 out of 5 stars ( 16 )

Estimated Ship Date: Tomorrow

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Alloy USA Axle Lock Kits for 1994-2004 RAM 1500, RAM 2500 - 450400

Axle Lock Kit, Front, Manual, Hardware, Dodge, Dana 44, Dana 60, 4WD, Kit

Part Number: ALY-450400

4.2 out of 5 stars ( 10 )

Estimated Ship Date: Tomorrow

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Alloy USA Axle Lock Kits 450500

Axle Lock Kit, Front, Manual, Hardware, Chevy, GMC, GM 7.2 in. IFS, Kit

Part Number: ALY-450500

2.33 out of 5 stars ( 3 )

Estimated Ship Date: Mar 9, 2026 if ordered today

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Estimated Ship Date: Mar 9, 2026 if ordered today

Alloy USA Axle Lock Kits for 1984-1991 CHEROKEE, 1987-1995 WRANGLER - 450920

Axle Lock Kit, Front, Manual, Hardware, 3-6 In Lift, Jeep, Dana 30, 4WD, Kit

Part Number: ALY-450920

4.33 out of 5 stars ( 3 )

Estimated Ship Date: Mar 9, 2026 if ordered today

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Estimated Ship Date: Mar 9, 2026 if ordered today

Alloy USA Axle Lock Kits for 1997-2003 F-150, 2004 F-150 HERITAGE - 450750

Axle Lock Kit, Front, Manual, Hardware, Ford, 5 Lug, 4WD, Kit

Part Number: ALY-450750

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Mar 9, 2026 if ordered today

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Estimated Ship Date: Mar 9, 2026 if ordered today

Alloy USA Axle Lock Kits 450600

Axle Lock Kit, Front, Manual, Hardware, Chevrolet, GMC, 6 Lug, 4WD, Kit

Part Number: ALY-450600

3.25 out of 5 stars ( 4 )

Estimated Ship Date: Mar 6, 2026 if ordered today

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Estimated Ship Date: Mar 6, 2026 if ordered today

Alloy USA Axle Lock Kits for 1985-1993 RAMCHARGER - 450450

Axle Lock Kit, Front, Manual, Hardware, Dodge, 5 Lug, 4WD, Kit

Part Number: ALY-450450

Not Yet Reviewed

Estimated Ship Date: Mar 9, 2026 if ordered today

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Estimated Ship Date: Mar 9, 2026 if ordered today

4x4 Posi-Lok Positive Axle Engagement Systems 600

Front Axle Actuator, Posi-Lok, Chevy, GMC, Kit

Part Number: POS-600

4.52 out of 5 stars ( 62 )

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American Powertrain Hydramax Hydraulic Clutch Release Systems HMGM01101G

Throwout Bearing Conversion, Hydraulic, Hydramax, GM, TKO/TKX/Muncie/Saginaw/Richmond/Lenco, Kit

Part Number: AWR-HMGM01101SR

3.9 out of 5 stars ( 41 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Positive Axle Engagement Systems 800

Front Axle Actuator, Posi-Lok, Chevy, GMC, Kit

Part Number: POS-800

4.45 out of 5 stars ( 29 )

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4x4 Posi-Lok Perm-Lok Systems 1100

Front Axle Engagement, Perm-Lok, Jeep, Dana 30/44/60, Kit

Part Number: POS-1100

4.21 out of 5 stars ( 14 )

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4x4 Posi-Lok Positive Axle Engagement Systems for 1984-1991 CHEROKEE, 1986-1991 COMANCHE, 1987-1995 WRANGLER - 920

Front Axle Actuator, Posi-Lok, Jeep, Kit

Part Number: POS-920

4.75 out of 5 stars ( 8 )

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Need It Sooner? We recommend these similar substitute parts:

RT Off-Road Mechanical Axle Engagement Systems for 1984-1993 CHEROKEE, 1986-1992 COMANCHE, 1987-1995 WRANGLER - RT23003

3.5 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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4x4 Posi-Lok Positive Axle Engagement Systems for 1984-1991 CHEROKEE, 1986-1991 COMANCHE, 1987-1995 WRANGLER - 900

Front Axle Actuator, Posi-Lok, Jeep, Kit

Part Number: POS-900

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Feb 23, 2026 if ordered today

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Estimated Ship Date: Feb 23, 2026 if ordered today

BD Diesel Front Axle Engagement Systems, Manual 1030710

Front Axle Engagement Systems Manual2 Low UnLoc - Chevy 2001-2014 2500-3500 4wd / 2001-2013 1500 4wd

Part Number: BDD-1030710

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 2, 2026 if ordered today

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Estimated Ship Date: Mar 2, 2026 if ordered today

BD Diesel Front Axle Engagement Systems, Manual 1030711

Front Axle Engagement Systems Manual2 Low UnLoc - Chevy 2015-2017 2500-3500 4wd / 2014-2017 1500 4wd

Part Number: BDD-1030711

Not Yet Reviewed

Estimated Ship Date: Feb 24, 2026 if ordered today

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Estimated Ship Date: Feb 24, 2026 if ordered today

Alloy USA Axle Lock Kits for 1984-1991 CHEROKEE, 1987-1995 WRANGLER - 450900

Axle Lock Kit, Front, Manual, Hardware, Jeep, Dana 30, 4WD, Kit

Part Number: ALY-450900

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Feb 26, 2026 if ordered today

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Estimated Ship Date: Feb 26, 2026 if ordered today

BD Diesel 2 Low Unloc Differential Kits 1030705

Differential Disconnect, Vacuum Actuated, Dodge, 4WD, Kit

Part Number: BDD-1030705

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 2, 2026 if ordered today

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Estimated Ship Date: Mar 2, 2026 if ordered today

BD Diesel 2 Low Unloc Differential Kits for 1994-2002 RAM 3500, RAM 2500, 1997-2001 RAM 1500 - 1030703

Differential Disconnect, Vacuum Actuated, Dodge, 4WD, Kit

Part Number: BDD-1030703

Not Yet Reviewed

Estimated Ship Date: Mar 4, 2026 if ordered today

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Estimated Ship Date: Mar 4, 2026 if ordered today

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