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.

Showing In Stock Items. Show All 14 Items.

Individual Parts

Part Groups

Results 1 - 4 of 4

Hughes Performance Pro Series 1 Stage Torque Converter Dump Valve Kits

Hughes Performance Pro Series Single Stage torque converter dump valve kits are single-stage complete kits for adding a dump valve to your Powerglide transmission. They offer increased stall speed while staging against the transbrake, faster engine/converter response, and reduced loading against the engine thrust bearing. They can also be applied down-track to help manage engine load and power application to the rear wheels. Hughes Performance Pro Series Powerglide torque converter dump valve kits are also available as upgrades on their Powerglide transmissions.

5.0 out of 5 stars ( 1 )

$653.99

Tilton 5.5 Ultra Clutch Assemblies

Tilton's 6-leg 5.5 Ultra clutch assemblies are a direct replacement or upgrade for the QM Optimum clutch—and they're Tilton's lightest weight 5.5 in. metallic racing clutch. The Ultras are designed and manufactured using proprietary materials and processes that increase service life of the clutch internals. They feature a rigid clutch cover that resists deflection, plus hardened steel thrust buttons installed into the legs—thus providing the most durability and highest performing clutch for the money, bar none. These clutches are rated for 500 lbs.-ft. of torque for two plate assemblies, and up to 750 lbs-ft. for three clutch units.

Not Yet Reviewed

$1,164.50

Manufacturer Rebate

GearStar GM 4L80E Level 4 Transmissions

GearStar GM high performance transmissions are built to the horsepower, torque, and rear gear ratio specs of the engine that it will be matched to. Unlike other high performance transmissions builders, GearStar individual transmissions are hand-built by one technician from start to finish. Before a transmission and torque converter leaves their facility, they are dyno tested for the equivalent of 100 miles, ensuring proper working condition. GearStar GM 4L80E Level 4 transmissions with torque converter are built with the highest quality parts available. "Heart-pounding performance with industry leading experience"; select the proper transmission for your build and "strap yourself in to experience uncompromising performance" with the "legendary road-proven craftsmanship" of GearStar Performance transmissions. Features and specs: * 800 hp * Up to 700 lb.-ft. of torque * Stall: 2,800 to 3,400 * Custom-built, custom-stalled 10 in. billet racing lock-up converter * Master overhaul kit with Alto hardened steels * Raybestos Stage 1 frictions * TransGo reprogramming kit * Filter * Torrington bearing kit * Bushing kit * Thrust washer kit * Internal wiring harness * New manifold pressure switch * New EPC solenoid * New PWM solenoid * New input and output speed sensors * New 1-2 and 3-4 shift solenoids * Expanded capacity forward clutch drum * Extra-capacity 2nd gear clutch assembly * Expanded capacity 3rd clutch drum * Heat-treated input shaft * 300M main shaft * 300M forward clutch hub * Updated molded steel direct clutch piston * Updated reverse band * New low roller assembly * Wide kickdown band with new apply piston * Heavy-duty intermediate sprag * Updated boost valve * Updated TCC regulator valve * Blueprinted pump and valve body * Transmission mount * New OEM steel pan

Not Yet Reviewed

$7,845.00

Tilton OT-III Heavy Duty Metallic Racing Clutches

Tilton OT-III heavy-duty metallic racing clutches offer the low moment-of-inertia, high-torque capacity and reliability necessary for the most demanding racing applications. These features have made metallic clutches the most common clutch type used in road racing and Circle Track racing. The included high-ratio pressure plate features short release travel for quick engagement and shifting, as well as a flat clamp load curve for longer wear range. Metallic clutches are not recommended for street use. They're available with different plate count, flywheel type, and spring color options. * Design: Open, one-piece clutch cover design provides lower operating temperature, high strength and minimal deflection for quick shifting * Engineering: Chrome vanadium diaphragm springs and an engineered pressure plate geometry provide a high clamp load-to-wear ratio, low release load and quick shifting * Materials: High-strength steel is used in both the pressure plates and the floater plates * Toughness: .104 in. thick friction disc withstands elevated temperatures while providing low inertia and excellent wear resistance * Operation: Hardened steel thrust buttons provide smooth and durable surface for pressure and floater plates * Testing: Every Tilton OT clutch is dynamically balanced to ensure the highest level of performance * Quality Assurance: Each OT clutch is individually inspected for proper assembly and balance, and initialed by the quality personnel as confirmation

Not Yet Reviewed

$871.25

Page 1 of 1