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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UMI Performance 1978-88 GM G-Body Brake Conversion Kits 304647

UMI Performance 1978-88 GM G-Body Brake Conversion Kits 304647

Brake hub, Aluminum, C5/C6 Brake Conversion Hubs, Bearings, Brackets, Kit

Part Number: UPI-304647

Not Yet Reviewed

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Summit Racing™ 9 in. Ford Grand National Rear-End Assemblies for 1978-1987 REGAL, MONTE CARLO, 1980-1981 CUTLASS - SUM-CSUMCT006

Rear End Assembly, Grand National, Ford 9 in., 31-Spline Axles, 5 x 4.75 in. Pattern, G-Body Mounts, Kit

Part Number: SUM-CSUMCT006

Not Yet Reviewed

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Moser Engineering Replacement C-Clip Axles A102810-1

Axles, Direct Fit, C-Clip, Rear, 1541H Steel, 28-Spline, GM G-Body, 7.5 in., Each

Part Number: MSR-A102810-1

Not Yet Reviewed

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Goodmark Clutch Bellcrank Pivot Kits GMK4041951587S

Bushing Kit, Clutch Bellcrank Pivot, GM, A-Body, B-Body, F-Body, G-Body, X-Body, C/K Pickup, Kit

Part Number: GMK-4041951587S

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Currie 9 in. Crate Rear End Assemblies CR-GG141TNBB

78-88 GM G-Body 9-Inch Crate, Black PC, 31-Spline Axle, 4.11 Ratio, Helical Worm Gear Differential, Brakes Not Included

Part Number: CUR-CR-GG141TNBB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG137TEBB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 3.70 Ratio, Helical Limited Slip, 11" Explorer Disc

Part Number: CUR-CR-GG137TEBB

Not Yet Reviewed

Estimated Ship Date: Today

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Currie 9 in. Crate Rear End Assemblies CR-GG135TWAB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 3.50 Ratio, Helical Limited Slip, 11" Wilwood 11" Dynapro Black Calipers

Part Number: CUR-CR-GG135TWAB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG137TNBB

78-88 GM G-Body 9-Inch Crate, Black PC, 31-Spline Axle, 3.70 Ratio, Helical Worm Gear Differential, Brakes Not Included

Part Number: CUR-CR-GG137TNBB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Moser Engineering Replacement C-Clip Axles A102801-1

Axles, Direct Fit, C-Clip, Rear, 1541H Steel, 28-Spline, GM G-Body, 7.5 in., Each

Part Number: MSR-A102801-1

Not Yet Reviewed

Estimated Ship Date: Today

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Currie 9 in. Crate Rear End Assemblies CR-GG137TWAB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 3.70 Ratio, Helical Limited Slip, 11" Wilwood 11" Dynapro Black Calipers

Part Number: CUR-CR-GG137TWAB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG141TEBB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 4.11 Ratio, Helical Limited Slip, 11" Explorer Disc

Part Number: CUR-CR-GG141TEBB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG130TEBB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 3.00 Ratio, Helical Limited Slip, 11" Explorer Disc

Part Number: CUR-CR-GG130TEBB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG130TWAB

Crate Axle, 78-88 GM G-Body Centurion 9-Inch, Black PC, 31-Spline, 3.00 Ratio, Helical Limited Slip, 11" Wilwood 11" Dynapro Black Calipers

Part Number: CUR-CR-GG130TWAB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

Currie 9 in. Crate Rear End Assemblies CR-GG135TNBB

78-88 GM G-Body 9-Inch Crate, Black PC, 31-Spline Axle, 3.50 Ratio, Helical Worm Gear Differential, Brakes Not Included

Part Number: CUR-CR-GG135TNBB

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

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Estimated Ship Date: Jan 26, 2026 if ordered today

American Powertrain Hydraulic Throwout Bearing Conversion Kits HMGM40060

GM 5-speed Hydraulic Clutch System for 1978-87 GM G-Body Monte Carlo, Malibu, Olds 442, El Camino Fits TKX/TKO/T10/Saginaw/Richmond/Jericho/DN4+3.. Ki

Part Number: AWR-HMGM40060

Not Yet Reviewed

Estimated Ship Date: Feb 27, 2026 if ordered today