Performance Parts

The Speedmaster GM 1955-57 Tri-5 Front 2" Drop Disc Brake Spindles (PCE180.1008) are precision-manufactured spindle assemblies designed for front disc brake conversions on classic 1955-1957 Chevrolet...

The Speedmaster GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft (PCE602.1009) is a high-strength replacement input shaft designed for GM 4L80 transmission builds and rebuilds. The 300M...

The Speedmaster PCE634.1009.02 is a billet aluminum full manual valve body designed for GM 4L80 automatic transmissions. This precision-engineered component replaces the factory valve body and...

The Speedmaster GM 4L80 Transmission Billet Aluminum Full Manual Valve Body (PCE634.1009.01) is a precision-engineered replacement component for GM 4L80 automatic transmissions. Manufactured from...

The Speedmaster PCE550.1013 is a performance-grade 6 pinion planetary gear set designed specifically for the GM 4L80 transmission. This precision-engineered component is built for builders and...

The Speedmaster GM 4L80-E Billet Adjustable Low Band Servo Piston Kit (PCE610.1007.01) is a precision-engineered replacement component designed for General Motors 4L80-E automatic transmissions. This...

The Speedmaster PCE216.1026 is a billet steel yoke designed for GM 6L80E six-speed automatic transmissions. This precision-engineered component features 32 spline engagement and is engineered to work...

The Speedmaster PCE204.1065 is a high-performance clutch plate for GM 8.5" and 8.6" 10 bolt limited slip differentials (LSD), engineered for vehicles requiring authentic 30 spline clutch engagement...

The Speedmaster PCE204.1025 is a TorqueWorm limited slip differential designed for GM 8.5" and 8.6" 10 bolt axle housings with 30 spline capability. This performance-grade LSD differential is...

The Speedmaster PCE204.1040 is a GM 8.875" 12 Bolt limited slip differential (LSD) engineered to replace factory open differentials in classic and high-performance vehicles. This 30 spline C-clip...

The Speedmaster PCE204.1039 is a GM 8.875" 12 Bolt limited slip differential engineered for street and strip performance. Featuring a 12P 35 spline configuration with TorqueWorm technology, this...

The Speedmaster PCE649.1001 is a GM alternator one wire conversion pigtail harness designed to simplify alternator wiring in classic and modern GM vehicles. This plug-in connector harness eliminates...

The Speedmaster GM Alternator Wiring Harness (PCE649.1002) is a conversion plug designed to bridge older 10si-case alternators with modern CS130-style charging systems. This harness enables seamless...

This Speedmaster GM C5 Corvette 13" slotted front disc brake conversion kit is engineered to upgrade the braking performance of your fifth-generation Corvette. The kit features slotted disc rotors...

The Speedmaster PCE204.1008 is a limited slip differential designed for GM Camaro models 2010 and newer equipped with the AAM 8.6 rear axle. This TorqueWorm-style LSD unit features 32-spline...