Transmission & Drivetrain
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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.
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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Summit Bucks
Sonnax Zip kits are engineered to cure common problems associated with today's automatic transmissions. Sonnax Zip kits eliminate: * Burnt clutches * Line pressure instability * Loss of fuel economy * No line rise * Pressure loss * Shift concerns * TCC apply and release concerns * TCC codes * Pressure switch codes
( 11 )
$99.59
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$235.14
TransGo's Performance shift kits give you the hard-launching, tire-blazing shifts you want, after just a few hours' work with basic hand tools. TransGo even has kits for computer-controlled, 4-speed automatics. Their performance shift kits can be installed with the transmission in the vehicle and they come with complete instructions. Some kits even include a step-by-step video to walk you through the installation process.
( 504 )
$29.57
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$321.43
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
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$356.54
TransGo automatic transmission reprogramming kits are designed with performance in mind. Most, but not all models contain additional features like Gear Command that allows you to hold manual low to any speed, and shift back to low at any speed. They are great for strip cars or 4x4 rock crawlers needing to select low and not have it upshift. Most TransGo automatic transmission reprogramming kits can be tuned for HD (Heavy Duty) use by following the recommendations in the kits.
( 39 )
$117.00
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$295.71
B&M Shift Improver kits are the easiest way to get the stout performance you've always wanted out of your automatic transmission. All you need are some hand tools and an afternoon, and you can turn your transmission into a B&M-tuned unit. Each kit has two stages to fit your needs: RV/Towing and Street/Strip.
( 108 )
$69.25
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$85.05
TransGo automatic transmission shift kits include the needed items to restore proper function to your valve body with much improved drivability and durability. A wonderful addition to your OEM classic vehicle. Features and benefits: * Raises overall line pressure * Calibration for a higher speed manual low * Crisp shift performance and more durability
( 5 )
$10.43
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$230.14
You'll have a heavy-duty, reliable transducer when you install BD Diesel valve body electronics upgrade kits. One of the leading causes of faults with automatic transmissions is failed governor pressure transducers, especially if you run higher line pressures. These kits replace the stock plastic transducer with a sturdy metal unit that can handle greater line pressures without failing; preventing over-pressure codes and wild oscillations, thus extending transmission life.
( 12 )
$282.95
TransGo valve body repair kits give you the components needed to restore proper shifts and correct other problems with your automatic transmission. They will help correct cold rough shifts, downshift problems, long shifts, hard or soft shifts and lockup problems. Repair your automatic transmission with TransGo valve body repair kits.
( 8 )
$10.29
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$219.20
TransGo automatic transmission TFSC SHIFT KIT Valve Body Repair Kits (P/N SKTFSC) fit 1960 and newer Chrysler, Dodge Plymouth, AMC, and Jeep vehicles with both small case 3-speed transmissions (such as the A904, A998, A999, TF6 and 30RH), as well as big case 3-speed transmissions (such as the A727, TF8, 36RH and 37RH) with or without lock-up. Common complaints on these transmission are soft shifts, loss of power on launch, pump bushing burn-up, TC clutch failure, stalls in reverse when hot, converter hub failure, and torque converter drain-back. * Features and benefits: The Shift Kit includes valve body components and modifications designed to deliver short smooth shifts and a better TC clutch apply. There are several innovative components in this kit. For instance, the line-to-converter feed system which helps the unit run cooler and promotes longer TC clutch life. Also included is a TransGo pioneered manual valve to reduce overnight forward and reverse delayed engagement complaints due to torque converter drain-back. Lastly, the kit can be installed with the transmission in the truck. * Corrects/Prevents/Reduces: -- TCC slip or shudder -- Reduces converter drain-back -- Soft shifts -- Loss of power on launch -- Converter hub failure -- Pump bushing failure * Includes: -- USA-made hardened steel manual valve with converter charge in park provision *(fits 1966 an dlater only) -- Mumbly peg (for easy detent spring and ball installation) -- PR valve shim, spring seat and inner spring for line-to-converter feed provision as well as outer spring for increased pressure -- Bypass valve spring -- Bypass ball spring -- Converter regulator valve spring
Not Yet Reviewed
$29.57
On Sale
Recalibrate your automatic transmission for optimum performance and extended life! B&M Transpak kits create new shifting characteristics by re-routing fluids through your transmission's valve body. Each kit includes two options: RV/Heavy-Duty and Hi-Performance Street. RV/Heavy-Duty is for towing, off-roading, or other heavy-duty use. Hi-Performance Street gives you quicker, snappier shifts than RV/Heavy-Duty, with standard shift points and automatic features when in "drive."
( 24 )
$199.95
$109.95
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$208.95
Z Automotive TranZformer electronic shift kits transform your car into a neck-snapping, tire-chirping fun to drive beast that at the press of a button, returns to stock. Best of all, they're completely hidden. Available in Gen 1 or Gen 2 kits, you can have your NAG1 transmission shift how YOU want it to. You get to modify shift firmness to fit your driving style/mood, plus a lot more. They install in minutes, connecting via wiretaps into wires hidden behind the steering column lower cover. Once installed, TranZformer kits will modify transmission parameters for that real "old school" muscle car shift feel. Chirp through gear shifts or just firm them up a little for towing or for track use; use your steering wheel buttons and EVIC screen (or cruise stalk/buttons for those without EVIC) to adjust shift firmness on-the-fly, whenever you want; connect to your PC via USB cable to dial-in independent upshift and downshift boost percentages (0 to 100) for each gear in both Drive and AutoStick mode. You can reduce the time delay when shifting into Reverse and Drive, adjust shift firmness scaling based on throttle position, and reset or kill the TCM's adaptive learning system, keeping the TCM from dialing back the shift firmness over time. Select the kit designed for your vehicle. Some of the features and benefits (may vary by kit): * Z Automotive Programming Utility (for Windows PCs only) allows you to program shift parameters, view status, update the firmware, and more * Steering wheel shifting (SWS) allows you to use your steering wheel's buttons to manually control gear shift while keeping your hands on the wheel * AutoUpshift allows you to set your own shift points when in AutoStick * Line Lock mode holds the vehicle with the front brakes so you can hit the gas and do a perfect burnout Peak rpm display: Will display actual shift rpms after each shift--great when adjusting auto upshift to squeeze every last bit out of that high revving cam, or to check what rpm you hit when shifting manually * 0 to 30 and 0 to 60 timer Reset adaptives: Will reset TCM adaptives any time you wish
Not Yet Reviewed
$289.00
Upgrade your automatic transmission with ATP shift improver kits. Sluggish shifts are replaced with faster shifts and the strong performance that you expect from your vehicle. ATP shift kits improve performance and extend the life of your transmission. Make your healthy transmission healthier with the addition of ATP automatic transmission shift improver kits.
Not Yet Reviewed
$46.50
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$68.99
TCI Trans-Scat valve body kits offer you two options: you can either have good, solid shifting that's well suited to towing, or you can have competition-style shifting. These kits eliminate slippage and lag, improve fuel economy, extend clutch life, and really improve the 2nd and 3rd gear shifts. In addition to delivering crisper shifting, they allow you to downshift on demand, and most will allow you to hold first gear for extended periods, such as when climbing long hills while towing. All kits give you the full range of normal automatic functions when in "drive."
( 20 )
$106.95
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$231.95
B&M's ShiftPlus electronic shift improvers use vacuums or electronics to improve the characteristics of your transmission, and let you change settings as you drive. Great for performance, towing, and RV use, these shift improvers recalibrate your transmission in one of two ways: Vacuum-style transmissions, such as a GM 4T60E, simply recalibrate the hydraulic system through the modulator circuit to provide firmer, more positive shifts; electronically controlled transmissions, such as a Ford AODE, recalibrate the transmission's hydraulic system electronically to give you a firmer, quicker shift, for better performance and longer transmission life. A flip of the switch allows the transmission to operate in the original factory mode at level 1 (firmer than factory) or level 2 (much firmer than factory). Either type installs in minutes with a few simple hand tools, without removing the pan.
( 11 )
$103.95
TCI valve body performance improver kits are designed to change the shift action to a more positive shift. Reduced shift time can add life to the clutches and bands and remove the lag time between shifts. These kits are easy to install and come with the necessary parts and gaskets to install the valve body.
( 4 )
$54.95
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$440.95
These TransGo automatic transmission shift valves will provide maximum throttle between the 3-4 gear shift. During highway speeds, the TransGo automatic transmission shift valves will keep the transmission in 4th gear, so there are no downshifts while at cruising speeds.
( 5 )
$63.00
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$88.71
TCI TH700-R4 kickdown kits prevent a forced part throttle kickdown from fourth to third gear, to allow cruising at high speeds in overdrive. With the kits installed, the transmission will only kick down from fourth to third at 3/4 throttle.
( 1 )
$95.95
Silver Sport front shift kits allow you to move the shifter from the stock rear location to the front at a more bench seat friendly 13.5 in. behind the clutch housing on specific 6-speed transmissions. They feature SST's short throw, billet shift tower with a compact and efficient design and accepts popular 2-bolt style handles. They include detailed instructions to walk you through the conversion.
( 2 )
$399.95
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$439.95
aFe ShiftLogic modules greatly improve the transmission shift feel in your diesel rig. The modules modify the transmission line pressure, resulting in improved shift firmness and reduced transmission slippage. They also reduce fluid temperature and extend the life of your transmission. aFe ShiftLogic modules have three different settings to personalize your shift feel, and the adjustment can easily be done with a simple push of the module button. aFe ShiftLogic modules feature: * Plug-and-play installation; no cutting or splicing wires * Ideal for performance driving and towing applications * Works with stock or modified transmissions * Adjustable LED settings; no LED—Stock, orange LED—Stage 1, red LED—Stage 2
Not Yet Reviewed
$408.00
Hurst Competition/Plus shifters have been the benchmark of transmission control and race-proven since 1963. When you are ready to install one, be sure to choose the correct kit for the right fit. Hurst Competition/Plus shifter installation kits are custom designed to fit directly into your vehicle, with the least possible modifications, and to give you firm positive shifts every time. They come with everything necessary (shifter not included) to install your Hurst Competition/Plus shifter in your car. Features: * All parts, hardware, and installation instructions * Hardened steel shift linkage rods * Nylon bushings and spring clips * Shifter mount plate
( 211 )
$299.95
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$425.95
BD Diesel short shift kits reduce the throw in your transmission by up to 20 percent. They provide a quick, accurate gear selection without those long, sweeping shift throws.
Not Yet Reviewed
$363.95
For the ultimate in performance, feel, and dependability, mount your Street Super shifter with the appropriate Hurst installation kit. The shifters mount high on the transmission allowing the shift arms to be almost completely straight for added strength and leverage when racing. Hurst Street Super shifter installation kits include the necessary mounting plate, shift arms, hardened steel shift linkage rods, rod adjusting buttons, nylon bushings, spring clips, necessary hardware, and instructions.
( 13 )
$318.95
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$399.95
On Sale
Shiftworks shifter conversion kits offer shifter solutions for a variety of make/model vehicles. If you've tried to use your factory-installed console or automatic floor shifter when swapping out your old transmission, you soon realize that it doesn't fit. But, with Shiftworks kits, they will. These assemblies have what you need to keep your classic ride looking original and shifting with modern performance. Whether you're replacing your Powerglide or upgrading to an overdrive transmission, your favorite factory shifter will still be there—and working great—thanks to Shiftworks shifter conversion kits.
( 72 )
$94.99
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$466.99
$85.49
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$420.29
B&M Hammer shifter conversion kits are designed for installing earlier 3-speed transmissions into late model Mustang applications. They include a new cable, a transmission shifting arm, and a shifter cable mounting bracket.
( 8 )
$169.95
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