Availability
Showing In Stock Items. Show All 171 Items.
Summit Bucks
Sonnax shift improver performance packs combine innovative heavy-duty performance calibration for firmer shifts under load without sacrificing low-speed drivability. The precision components in these kits upgrade your transmission for maximum achievement and durability by recalibrating pressures, recalibrating shift accumulation, and including improved parts for areas that commonly wear. They are suitable for any heavy-duty application and are a critical foundation for other upgrades when modifying the transmission for high performance use. Sonnax shift improver performance packs additional facts and features: * Shorter shifts, which get progressively firmer with load * Faster pressure increase and higher overall pressure for greater clutch/band holding power * Three ultra-reliable, patented, billet pinless accumulator pistons * Unique 1-2 accumulator spring combination for shifts with character * Improved high rpm pressure * Third accumulator valve gets the 2-3 right the first time, every time * Consistent results, no guessing on calibration * Prevents worn accumulators and separator plate * Optional TCC on-off conversion prevents excess TCC pressure
( 6 )
$166.99
—
$356.54
Summit Bucks
Not all converters are what they promise or claim to be. Superior performance costs money--always has and always will. With Yank, you get what you pay for. Yank Performance SS Series torque converters are the ultimate street/strip units, working great on NOS or N/A. All SS Series models are highlighted by a 9.5 in. billet steel construction and a solid billet lock-up clutch. Select from stall speed, transmission type, and single or 3-disc options to purchase your ideal Yank SS converter for your vehicle. Features: * Rated to 650 RWHP * One-piece roller burnished hub for long seal and bushing life * New Torrington bearings * Fully furnace brazed pump and impeller * Hardened input and turbine splines * One free re-stall in first year * 3 yr. warranty
Not Yet Reviewed
$1,098.99
—
$1,206.99
Summit Bucks
Yank Performance offers Pro Truck Series torque converters for a variety of transmission applications. These top-of-the-line 10.5 in. street/strip billet converters feature solid billet lock-up clutch and can handle up to 1,200 rear-wheel horsepower. Additional details: * One-piece roller burnished hub * New Torrington bearings * Fully furnace brazed pump and impeller * Hardened splines * Different stall speed options
Not Yet Reviewed
$1,098.99
—
$1,419.99
Summit Bucks
Not all converters are what they promise or claim to be. Superior performance costs money--always has and always will. With Yank, you get what you pay for. Yank Performance Pro Yank Series torque converters are top-of-the-line 10.5 in. billet units with a solid billet lock-up clutch. They are designed for large shots of NOS and boosted applications. Select from stall speed and single or 3-disc options to purchase the ideal Pro Yank converter for your vehicle. Features: * Rated to 1,200 RWHP * One-piece roller burnished hub for long seal and bushing life * New Torrington bearings * Fully furnace brazed pump and impeller * Hardened input and turbine splines * One free re-stall in first year * 3 yr. warranty
Not Yet Reviewed
$1,098.99
Summit Bucks
Clearance
Yank Performance introduces its new line of Power Adder Series (PAS) converters. These are 9.5 in. billet converters based around the successful SS Series product line. This new line of converters is specifically designed for power adder cars with NOS, small turbo, or superchargers. These models will couple up quicker and multiply torque harder. They're rated to 650 RWHP. Order the model with bolt circle designed to fit your application. Additional details: * One-piece roller burnished flanged impeller hub * New Torrington bearings * Fully furnace brazed pump and impeller * Hardened input and turbine splines * Extra-wide oversized lockup clutch material to handle added abuse put down by more horsepower and torque
Not Yet Reviewed
$1,098.99
$879.50
—
$1,206.99
Summit Bucks
Yank Performance offers SC Series torque converters for a variety of Chevy transmission applications. They're built on a 10.5 in billet platform with a solid billet lock-up clutch. These converters are designed to work well with positive displacement superchargers and are rated to 1,200 rear-wheel horsepower. Additional details: * One piece roller burnished hub * New Torrington bearings * Fully furnace brazed pump and impeller * Hardened splines * Stall speed options
Not Yet Reviewed
$1,098.99
Summit Bucks
Yank Performance offers Eliminator Series custom torque converters for a variety of transmission applications, including Powerglide, THM350, and THM400 models. These fluid couplings allow the engine to spin independently of the transmission in automatic vehicles, enabling the engine to keep running when the car is stopped, and facilitating smooth power transfer. The replacement street/strip converters are available in a variety of stall speed ratings, input spline quantities, diameters, and other options.
Not Yet Reviewed
$1,098.99
Summit Bucks
Sonnax enhanced performance accumulator springs provide firmer 1-2 shifts for enthusiasts who appreciate quick, positive shift feel in their GM units. The design of these springs provides a performance shift feel, without reducing accumulator piston travel. This allows for a firmer—but still cushioned—shift that minimizes shock to the band and shafts. These springs also may be used as a replacement for THM 350 direct accumulator piston springs. Hit the road enjoying the perfect shift feel with Sonnax enhanced performance accumulator springs.
( 2 )
$12.38
—
$25.91
Summit Bucks
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 4L65E Level 3 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: * 500 hp * Up to 500 lb.-ft. of torque * Stall: 2,600 to 3,200 * High performance 12 in. furnace-brazed converter -- Flanged hub and carbon fiber clutch * Master overhaul kit with Alto hardened steels * Raybestos Stage 1 frictions * Filter * 29-element dual cage sprag * High-capacity upgraded pump assembly * New hardened pump rings * New 13-vane pump rotor * New vanes * New stator * .500 boost valve * Pressure regulator valve * Updated boost valve * TransGo reprogramming shift kit with Shift Command * Bushing kit * New thrust washers * Complete Torrington bearing kit * Heavy-duty hardened sun shell * Heavy-duty expanded capacity input drum with reinforcing sleeve * High-rev spring kit * Corvette servo * Carbon fiber wide 2-4 band * New valve body spacer plate * Fill tube and stick * New shift solenoids * New EPC solenoid * New PWM solenoid * New 3/2 solenoid * New manifold pressure switch * New internal wiring harness with new TCC solenoid * New electronic speed sensor * Transmission mount * New OE steel transmission pan
Not Yet Reviewed
$4,945.00
Summit Bucks
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
( 1 )
$7,845.00
Summit Bucks
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 4L65E 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: * 650 hp * Up to 600 lb.-ft. of torque * Stall: 2,600 to 4,000 * Custom-built and custom-stalled 10 in. or 11 in. billet racing lock-up converter * Master overhaul kit with Alto hardened steels * Raybestos Gen II racing frictions * Filter * 29-element dual cage sprag * High-capacity upgraded pump assembly * New hardened pump rings * New 13-vane pump rotor * New vanes * New stator * .500 boost valve * Pressure regulator valve * Updated boost valve * TransGo reprogramming shift kit with Shift Command * Complete Torrington bearing kit * Bushing kit * Thrust washers * Heavy-duty hardened sun shell * Heavy-duty expanded capacity input drum with reinforcing sleeve * High-rev spring kit * 5-pinion heavy-duty front and rear planetary gear sets with sun gear * Hardened output shaft * Hardened reaction shaft and hub * Super hold 4th servo * Corvette servo * Wide carbon fiber wide 2-4 band * New internal wiring harness with new TCC solenoid * New shift solenoids * New EPC solenoid * New PWM solenoid * New 3/2 solenoid * New manifold pressure switch * New electronic speed sensor * New valve body spacer plate * New OE steel transmission pan * Transmission mount
( 2 )
$5,945.00
Summit Bucks
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 3 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: * 600 hp * Up to 600 lb.-ft. of torque * Stall: 2,600 to 3,600 * Custom-built 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 and main shafts * Heat-treated forward steel 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 * Blue printed pump and valve body * Transmission mount * New OEM steel pan
Not Yet Reviewed
$6,845.00
Summit Bucks
GearStar offers level 2, 3, and 4 Ford performance transmissions, custom built by one of their master technicians from start to finish, then dyno tested with converter to the equivalent of 100 miles, ensuring the transmission and converter package is in perfect operating condition before leaving their facility. GearStar Ford 4R70W Level 4 transmissions come fully equipped with a 20,000 GVW cooler, and a variety of customizations geared towards high performance driving. "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: * 750 hp * Up to 550 lb.-ft. of torque * 10 in. custom built, custom stalled, multi-disc forged billet lock-up converter * Stall: 2,600 to 4,500 * Master overhaul kit with Alto hardened steels * Raybestos Gen II Racing frictions * High performance valve body reprogramming kit * New electronics: -- Updated EPC -- Shift solenoids -- Lock-up solenoid -- Internal wiring harness -- Output sensors * High-flow filter * Complete Torrington bearing kit * New bushing kit * New reverse band * Carbon fiber wide O.D. band * 300M hardened intermediate shaft * Heat-treated and stress relived input shaft * High-capacity 4-plate intermediate clutch * Direct clutch pack (eight frictions) * Wide reverse drum with mechanical diode * Updated sun shell and gear * New low spring and roller * High-capacity pump assembly with new gears * Updated O.D. servo pin and piston * Updated dual O-ring 3rd accumulator piston * Custom 360-degree adjustable shift linkage arm * Transmission mount
Not Yet Reviewed
$8,095.00
Summit Bucks
GearStar Ford 6R80 Level 4 transmissions come with a custom billet Yank Performance lockup torque converter. This is the first of many upgrades that go into making sure that each transmission is built for performance applications to handle up to 750 crank horsepower or 700 crank foot-pounds of torque. These units have a brand-new valve body, brand new pump, billet intermediate shaft, expanded capacity clutches and steels, upgraded transmission cooler bypass valve, several valve body upgrades. They come with all new electrics, including the wiring harness, all sensors and solenoids—along with all new bushings, bearings, and seals. Every Level 4 transmission is assembled by one of GearStar's five expert builders. The transmission packages arrive dyno tested with 100 miles already on the product, which means the break-in procedure has been done and they're ready to go! Ford 6R80 Level 4 transmission models are available for 4WD or RWD applications.
Not Yet Reviewed
$9,745.00
Summit Bucks
Sonnax return springs are available in a variety of styles to assist in your automatic transmission rebuild. Replacement part types include high clutch return springs, pump slide springs, detent springs, reverse clutch return springs, and more. They're machined from quality materials for long-lasting performance, and can be ordered individually or in larger quantities. Select the springs required for your specific transmission application.
( 4 )
$3.38
—
$17.11
Summit Bucks
Sonnax input carrier kits transform OE wide-ratio automatic transmissions into a close ratio for game-changing acceleration on the track. Manufactured and engineered for outstanding durability, these kits keep your engine in the optimal power band, while allowing a longer pull in first and second gears, improving consistency and performance. The input carrier gears are precision-ground to OE standards and feature thrust washers with a highly wear-resistant, PTFE-coated material, plus a thicker captured bearing. Lube channels direct oil to the pinion pins, and the carrier can be disassembled for inspection and service. Stay in the power band with Sonnax input carrier kits.
( 3 )
$855.99
Summit Bucks
ACDelco GM Genuine Parts flexplates are designed, engineered, and tested to rigorous standards and backed by General Motors. They're true OE parts that will replace your originals with the same fit and performance, and are updated to integrate new materials and technologies. Order the flexplate model recommended for your vehicle.
( 7 )
$95.99
—
$131.99
Summit Bucks
The ideal upgrade for performance vehicles with the GM 6L80 or 6L90 transmission, Sonnax extreme-duty 4-5-6 clutch hub and intermediate shaft guarantees maximum protection against shaft breakage. The unique hub design improves oil flow and accepts Powerglide-style frictions to optimize clutch durability. In place of the 2-piece shaft/hub, Sonnax uses a much stronger, one-piece design that eliminates the OE assembly's weak, welded connection. It is custom forged from ultra-high-strength 300M billet steel, and then heat-treated and shot-peened for added durability. This combination of features guards against broken 4-5-6 hubs and the risk of rear splines shearing off.
Not Yet Reviewed
$1,015.08
—
$1,157.55
Summit Bucks
Sonnax Smart-Tech drum modules for racing GM TH400 transmissions improve on-track performance and consistency, leading to quicker ETs, more wins, and greater reliability. The TH400 is preferred for its overall durability and multitude of available ratios, but is known to be heavier and less efficient than the popular two-speed Powerglide. Part of the TH400 inefficiency results from the fact that the direct drum counter-rotates, spinning backwards in 1st gear, brakes to a complete stop on the 1-2 shift, then goes from 0 RPM to input RPM on the 2-3 shift. Significant energy is wasted through this cycle that robs power, upsets traction on the shifts, and contributes to broken internal parts. Compared to aluminum direct drums, the Smart-Tech drum module reduces the weight of the counter-rotating components by over 3.3 lbs.! And more significantly, because the weight of the Sonnax counter-rotating parts is closer to the centerline, there's a 68 percent reduction in energy required to stop and restart during the 1-2 and 2-3 shifts. The benefits are increased wheel horsepower, better acceleration, less shock on the shifts, and improved durability. * Complete kit (34555-01K) replaces both forward and direct drums and includes everything from intermediate sprag to the pump; a selection of Sonnax input shafts is available separately. * 100 percent new content, no used core pieces * Includes larger-diameter, 36-element sprag and sprag race that works with OE intermediate clutches * Includes six-friction forward clutch pack and seven-friction direct clutch pack Contents: * Forward Piston Housing * Forward Piston * Forward Piston Return Springs (16) * Forward Spring Retainer * Forward Snap Ring * O-Ring 1.674 in. * Lip Seals (2) * Direct Housing Assembly * Direct Piston * Direct Piston Return Springs (26) * Direct Spring Retainer * Direct Snap Ring * O-Ring 2.737 in. * Sprag Shaft * Front Sprag Retainer Plate * Heavy-Duty Sprag 36 Element * Outer Sprag Race * Rear Sprag Retainer Plate * Sprag Retainer Screws (4) 6-32 x 5/16 in. * Quad Ring Seals (2) * Anti-rotation Seal Rings (2) * Drum * Pressure Plate * Outer Snap Rings (4) * Bearing Small * Forward Clutch Hub * Bearing Large * Direct Clutch Hub * Steel Clutch Plates (4) .060 in. * Steel Clutch Plates (11) .077 in. * Friction Clutch Plates (13) .080 in. * Clutch Separators (60) .103 in.
Not Yet Reviewed
$3,052.40
Summit Bucks
ACDelco offers transmission bellhousings for a wide range of vehicles from the 1990s and up. Built from aluminum, these GM-recommended replacements deliver the quality and durability of original equipment, plus a factory fit and solid performance. The bellhousings are available for nearly two dozen transmission models. Order the unit designed for your application.
( 8 )
$239.99
—
$659.99
Summit Bucks
No weak link! Sonnax heavy-duty one-piece input shafts are custom-forged from one solid piece of ultra-high-strength 300M steel. Much better than the weak OE 2-piece shaft/hub design, this single piece delivers a more robust build that will work hard longer. With durability and performance features which are second to none; your only choice should be Sonnax heavy-duty one-piece input shafts.
Not Yet Reviewed
$440.14
—
$678.70
Summit Bucks
Sonnax heavy-duty automatic transmission output shafts allow energy to be absorbed via their torsional design, reducing peak power loads to critical areas. This, in turn, prevents shaft failure common in certain GM units. These steel output shafts are precision engineered and manufactured for unbeatable performance in high-horsepower street and strip builds. They're available in various lengths, and feature many unique refinements available only from Sonnax.
( 2 )
$722.91
—
$774.01
Summit Bucks
Sonnax universal remanufactured valve bodies have been uniquely designed to fit a variety of '99-later Chrysler applications, regardless of OE checkball or solenoid configuration. The convenience of stocking one SKU number for various applications saves time, money and interchangeability confusion. The channel casting has been resurfaced to SAE recommended flatness and surface finish. The seasoned casting warpage is now eliminated, removing cross-leaks and manufacturing burrs that resulted in clutch distress and shift complaints. A new separator plate is also installed, along with gaskets, to seal the critical surfaces between the valve body and channel casting. Heavy-duty/high performance accumulator pistons with dual-guide seals are installed to prevent piston-to-bore scuffing and restore clutch pressures due to leakage. Patented Sonnax valves are installed to restore hydraulic pressures and eliminate shift complaints, trouble codes, converter concerns and overdrive clutch distress. Their patented accumulator cover plate—made from stronger, thicker material and secured with additional screws—is also installed to prevent flexing or breakage. To guarantee the highest level of operational performance, these remanufactured valve bodies are tested on state-of-the art equipment to verify that pressures match OE specification. Product notes: * One SKU fits all applications, saving time, money and confusion * Resurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively * New separator plate and gaskets provide critical seal between cast surfaces * Patented Sonnax valves and pistons restore hydraulic integrity of circuits to eliminate shift complaints and clutch distress * Patented Sonnax accumulator cover plate stronger than OE to prevent flexing and breaking
( 2 )
$421.93
—
$680.85
Summit Bucks
These TCI transmission Master Racing overhaul kits are designed for racers who maintain their own transmissions. They contain parts that are required when freshening up an existing competition transmission. You'll receive the high performance filter, clutches, steels, seals, gaskets, and bushings normally replaced during a rebuild. In addition, kits for late model GM overdrive transmissions also include a new performance band.
( 58 )
$197.95
—
$629.95
Modal Header
Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
