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Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in...
Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in the future.*
*Not redeemable for cash; cannot be used to buy gift cards.
Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in the future.*
*Not redeemable for cash; cannot be used to buy gift cards.
Showing In Stock Items. Show All 57 Items.
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
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
Summit Bucks
Top Street Performance adjustable column shift linkage kits are a great way to easily connect your transmission to your shift column. Whether you've swapped the transmission, installed an aftermarket steering column, or both, this is the perfect way to put them together. The kits come with a 21 in. stainless steel rod which can be cut to fit. They include all necessary hardware and are designed to take the hex connector at either end to accommodate any clearance needs. Order the kit recommended for your automatic transmission application.
( 2 )
$55.56
Summit Bucks
Sonnax Sure Cure automatic transmission rebuild kits are a comprehensive reconditioning package—featuring the best Sonnax products developed to help mechanics restore and enhance transmission performance. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints, as well as other transmission problems. The high-quality components in each Sure Cure kit will repair worn areas and protect the transmission against future damage. Plus, each kit comes with an easy-to-read, step-by-step installation guide that covers inspection and repair of the most critical areas of the valve body. Additional features and benefits: * Restore shift quality and reduce comebacks * Repairs biggest trouble areas to reduce comebacks * Includes step-by-step instructions for comprehensive valve/pump body restoration Kits Include: * Shims (2) endplay * Pump slide pivot pin * Throttle valve plunger valve kit * Shortened TV link * TV cable corrector kit * Seals D-ring servo * 1-2 or 3-4 accumulator spring * Servo release check valve kit * Reverse boost valve kit * Oversized pressure regulator valve * Pinless 1-2 or 3-4 accumulator piston kit * TV boost valve kit * Bushing pump * Bushing rear stator support * Checkballs
( 6 )
$100.75
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$176.90
Summit Bucks
TCI Maximizer rebuild kits are ideally suited for off-road, towing, and other severe-duty applications. Each kit contains gaskets, seals, new premium-quality frictions, steels, a high-volume filter, and a drain plug. Also included are valve body recalibration modifications, which provide crisper shifts without the harsh feel found in kits designed for racing. Durability is improved because less heat is generated per shift than is associated with the OEM shift characteristics. TCI Maximizer rebuild kits also increase the torque capacity of the transmission to make towing or off-roading a breeze.
( 18 )
$333.95
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$391.95
Summit Bucks
Sonnax Super-Hold servo kits offer increased apply area over the OEM servo for more holding force between shifts. They are manufactured from anodized aluminum and include mounting seals and hardware for your specific transmission model. Their improved seal design will conserve pump volume.
( 25 )
$91.85
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$292.41
Summit Bucks
If you're looking for an easy upgrade to your automatic transmission, Sonnax Servo piston kits may be the answer. The improvement in shift quality is an immediate and noticeable value. These direct replacement kits will help to eliminate a bit of a "sloppy" gear performance caused by faulty OEM servo units. With all necessary rings and seals to prevent leakage and handle higher pressure, Sonnax servo pistons can be your link to greater band apply force. Choose the kit that matches your vehicle specs, then expect faster and firmer shifts!
( 30 )
$15.14
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$352.46
Summit Bucks
Sonnax C ratio servo kits offer greater holding power, giving cleaner, firmer 1-2 and 2-3 shifts. They are machined from 6061 aluminum billet and feature lip seals on the piston for superior sealing over a wide range of fluid pressure. The C ratio servos are the largest in the C4 family, and will work equally well in performance C5 applications. The pins incorporate two PTFE sealing rings to insure the hydraulic integrity of the pins in worn cases. Experience firmer shifts with Sonnax C ratio servo kits. Kits include: * Piston * Cover with either purple anodized or machined finish * Servo pin with seal grooves * Gasket * Retaining ring * Spring * PTFE seals * Large and small lip seals
( 1 )
$224.07
Summit Bucks
With its .63 ratio, these Sonnax 2nd gear servo kits are an ideal option when upgrading GM 4L60-E and 4L65-E applications to improve shift feel without risk of harsh 1-2 shifts. They improve 4L60-E and 4L65-E shift feel and durability without harshness. D-Rings used in place of seal rings enhance sealing during apply and release. Sonnax 2nd gear servo kits include: * Piston * Housing * Piston D-Ring small * Piston D-Ring large * Housing O-Ring
Not Yet Reviewed
$150.39
Summit Bucks
These Sonnax 2nd Gear Corvette ratio servo kits provide increased apply area resulting in improved holding power for firmer 1-2 and 3-4 shifts in 4L60 (700-R4) and 4L60-E transmissions. The servo piston features D-rings in place of the OE seal rings for improved sealing during apply and release. They are compatible with Sonnax 4th Gear Super Hold dual servo kits. Sonnax 2nd Gear Corvette ratio servo kits include: * Piston * 2 Piston D-Rings * Housing * Housing O-Ring
( 2 )
$57.53
Summit Bucks
In GM TH350 and TH350C units, the intermediate servo bore becomes scored from repeated cycling. The spring side of the piston has line pressure present in R, N, D. Excess leakage at the servo piston results in low line pressure and delayed engagements. During forward speeds, oil loss affects shift quality and reduces clutch life. To salvage cases, install a Sonnax intermediate servo sleeve kit (35709-01K). * Contains an aluminum sleeve and a replacement piston with a PTFE seal * Drop-in solution requires no machining of the transmission case * Contents: Sleeve, servo piston, and Seal PTFE
Not Yet Reviewed
$29.63
Summit Bucks
You have a seal leak. The culprit is a cracked OE manual shaft bushing that allows moisture and dirt ingress from the top of the transmission case. The solution is to save the shaft and install a Sonnax shift shaft saver kit. Sonnax's patent-pending shift shaft saver kits replace the OE bushing--without removing and re-welding the shift lever. Since the Sonnax bushing is made from upgraded material, you can be confident of a solid repair, with no risk of comeback. Shift shaft saver kit contents: * Bushing--Delrin® won't absorb atmospheric moisture * Sleeve PTFE * Two O-rings (one extra) * Two retaining clips (one extra)
Not Yet Reviewed
$30.51
Summit Bucks
Sonnax torque converter conversion kits are designed to upgrade the existing torque converter for improved performance characteristics like better acceleration, increased power, and smoother shifting. Many conversion kits focus on changing the stall speed, which is the engine rpm at which the torque converter fully engages, allowing for more aggressive launches or better towing capability depending on the chosen stall speed. Some kits include modifications to improve the lock-up function of the torque converter, leading to better fuel economy at cruising speeds by eliminating slippage. The torque converter conversion kits by Sonnax come with various internal component options, allowing fine-tuning to match your vehicle's specific needs and your driving style.
Not Yet Reviewed
$328.58
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 )
$456.95
Summit Bucks
Sonnax 3-4 relay O-ringed end plug kits help restore hydraulic integrity at the end plug of your transmission's valve body. In GM 4L60-E, 4L65-E and 4L70-E units, the hammering effect of the 3-4 relay and/or 3-4 shift valves can cause the end plugs to wear, resulting in loss of 4th signal and/or D3 oil. Replace the worn OE end plugs with a Sonnax 3-4 relay O-ringed end plug kit to prevent critical losses and provide a positive seal. Contents: * 5 end plugs (includes 3 extra) * 5 O-rings (includes 3 extra)
( 3 )
$29.25
Summit Bucks
GM 6L45, 6L50, 6L80 and 6L90 automatic transmission units may exhibit multiple line pressure and cooler/converter/lube flow problems due to excess wear in the pressure regulator bore. Deterioration at the balance spool end allows critical fluid loss, resulting in high line pressure, harsh shifts, and overheating due to reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches. Installing a Sonnax pressure regulator valve kit restores the hydraulic integrity of these circuits for proper line pressure control in all ranges. A new pressure regulator valve outer spring is also included to replace weakened original springs and provide a modest 5 psi increase across the pressure curve. Additional details: * Hardcoat anodized aluminum valve combats premature wear * Lengthened critical spools operate in non-worn portion of bore for added stability and wear prevention * Annular grooves help center valve in bore to reduce future side-load wear * Drop-in Zip Valve parts install quickly and easily Kit contents: * Valve * Spring * Drill bit .040 in. * 2 checkballs (1 extra)
( 2 )
$13.40
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$62.55
Summit Bucks
Sonnax Line pressure booster kits allow you to shift aggressively and then feel the tranny grab the clutches with more power when it changes gear. The larger boost valves and matching regulator springs raise line pressure progressively as higher pressure is commanded. These kits modify the sensor signal, which causes the computer to create a pressure increase. They're installed between the pressure sensor and vehicle harness using OE-style sealed connectors; no modifications are needed to the transmission.
( 14 )
$17.12
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$82.70
Summit Bucks
Sonnax governor gear kits include nails and a roll pin. A common failure point of your governor is the gear. When you need to replace it, Sonnax governor gear kits will restore timely shifts of your automatic transmission.
( 17 )
$4.53
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$5.22
Summit Bucks
Wear at the piston pin bore surface can result in poor shift quality and burnt clutches and bands. Sonnax pinless accumulator piston kits prevent pin bore leakage. They're also longer to stabilize the piston and prevent piston cocking. They feature dual seals to stabilize and completely seal the bore, and steel balls to plug the existing pin bore. Fluid loss through the piston pin bore will no longer be an issue when you invest in Sonnax piston kits.
( 17 )
$8.94
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$10.86
Summit Bucks
Bore wear at the compensator feed regulator valve allows critical pressure loss that prevents proper clutch timing and control, resulting in harsh shifts, bind-up, and possibly, burnt clutches. You can recover hydraulic control and renew shift performance by installing a Sonnax compensator feed regulator valve kit. These kits featuring a Sonnax drop-in Zip Valve provide you with valve, spring, sleeve, and retaining clip to restore normal compensator action. Features and benefits: * Hardcoat anodized aluminum valve combats premature wear * Highly wear-resistant aluminum sleeve provides additional valve support * Includes calibrated spring for restoring OE compensator pressure * Drop-in Zip Valve parts install quickly and easily
Not Yet Reviewed
$38.44
Summit Bucks
Vehicles with a GM 8L45 or 8L90 automatic transmission may exhibit high or low line pressure that results in harsh/soft shifts, burnt clutches, loss of cooler and lube flow, and overheating of the transmission and converter. These problems may be caused by wear of the pressure regulator bore casting at the VFS signal port area and/or at the shuttle valve sleeve. Wear at the inboard port of the pressure regulator bore allows VFS (throttle) signal pressure to leak, preventing proper action of the pressure regulator valve and potentially allowing it to remain in the low line pressure position. Wear of the shuttle sleeve due to continuous oscillation of the shuttle valve creates a path for balance line pressure at the pressure regulator valve to exhaust, resulting in excessive low line pressure. Sonnax drop-in pressure regulator and shuttle valve kits restore hydraulic integrity to the lineup by addressing wear that subjects the transmission to either excessively high or low line pressure with upgraded materials and unique designs. The pressure regulator valve has been designed with a lengthened spring pocket spool at the VFS signal port area, which provides over double the sealing capability to this critical end of the valve and allows it to operate in unworn portions of the bore. The length of the critical shuttle valve diameter has been significantly lengthened to provide better sealing and durability of the assembly. Additional details: * Hardcoat anodized aluminum valves and highly wear-resistant billet aluminum sleeve combat premature wear * Pressure regulator valve VFS signal spool 200 percent longer than OE and operates in unworn area of the bore * Critical shuttle valve spool made 30 percent longer than OE for added sealing and durability * Drop-in Zip Valve parts install quickly and easily Kit contents: * Pressure regulator valve * Spring * Shuttle valve * Shuttle sleeve
Not Yet Reviewed
$65.06
Summit Bucks
Continuous oscillation in relay valve and sequence valve bore causes wear that prevents proper hydraulic control. You can recover hydraulic control and renew 2nd and 4th gear operation by reconditioning the entire bore and installing a Sonnax oversized 4-3 sequence valve kit. These kits address wear on the inboard two spools that is increasingly more common in aging valve bodies. Wearing at these spools can allow valuable 4th servo feed leakage, resulting in no 4th and 2-4 band wear, and can also allow leakage of 2nd clutch oil needed to apply the 2-4 band in 2nd gear, resulting in poor 2nd gear shifts. Leaking at the OE end plug also allows oil loss that can leave 4th gear inoperable. Sonnax oversized 4-3 sequence valve kits feature hardcoat anodized aluminum valves to combat premature wear and O-ringed end plugs to help prevent 4th gear oil loss. Kit contents: * 3-4 relay valve * 4-3 sequence valve * Spring * End plug * Two O-rings (1 extra)
Not Yet Reviewed
$51.20
Summit Bucks
Sonnax servo release check valve kits are unique solutions. Since the GM 4L60 (700-R4) and 4L60-E Series transmissions were introduced, they have had inadequate metering of 2nd gear band servo release oil resulting in 3-4 clutch pack failure. The 3-4 clutch pack and 2nd gear band are just not properly synchronized. Sonnax servo release check valve kits combine an orifice with a ball check valve to resolve these issues and successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. Other benefits: * Provides sufficient exhaust so that 3-2 downshifts are smooth * Calibrates 3-4 clutch feed orifice without creating shift concerns
( 4 )
$10.60
Summit Bucks
Sonnax actuator feed limit valve kits eliminates problems with the OE AFL valve design in GM 4L60-E, 4L65-E and 4L70-E units. OE designs have a large reaction area and are highly affected by side loading which wears the valve body bore, resulting in lower oil pressure to the shift solenoid and lower line pressures. Sonnax kits include a redesigned AFL valve and a wear-resistant sleeve to regulate pressure and re-establish proper pressure control. The hardcoat anodized aluminum valve features annular grooves to prevent side loading and has 54 percent more support by operating in the full contact sleeve. Sonnax kits include valve, sleeve, spring, and retaining clip.
( 1 )
$37.81
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