LEVEL 2 – PRO RACE 700R4… supports up to 700HP

Pro Race K-Case Transmission

LEVEL 2 – PRO RACE 700R4… supports up to 700HP

Our Pro Race series transmission is the finest built street/race automatic transmission in the industry. These transmissions are tough and built to handle whatever you dish out. It's rated at 700 RWHP...

Price : $ 3,500.00 Add to cart


Pro Street Series (Level 2)
Pro Race Series (Level 2) 700R4

A Core is Required to Build this Transmission

Our Pro Race Series transmission is the finest built street/race automatic transmission in the industry. These transmissions are tough and built to handle whatever you dish out. We incorporate all the updates and modifications to compensate for the problems and issues they were born with from the factory. We believe you will not find a better performance transmission anywhere!

Below are the details of our Pro Race (LEVEL-2) built transmission.

First, each core transmission is disassembled and carefully inspected. The case and hard parts are cleaned thoroughly and re-inspected for cracks, wear, or other damage before we begin. The case is specially prepared and a coating of and heavy duty, heat resistant, oil based enamel is baked on, creating a hard and durable glossy finish. The seals in the case are then replaced and assembly begins.

The rear 4-pinion planetary assembly and bearings are meticulously inspected, then assembled into the case along with heavy duty reverse friction and steel plates. At this time the center support and sprag (one way roller) are installed after being inspected for stress cracks and damage. In addition, dual bushings are installed in the rear sun gear to handle the extra weight of the beast sun shell.

Next, the sun gear is inspected and modified to improve lubrication to the rear 4-pinion planetary assembly. This allows oil to escape from between the bearing and the gear it rests against, feeding additional lube to the planetary gears. This is a huge improvement and virtually eliminates one of the most common points of failure for this type of transmission. In fact, contrary to common opinion, the rear planetary assembly in these transmissions is not, in any way, weak by design. Their failure is almost exclusively due to a lack of lubrication. When you see one of these with a damaged rear planetary, it will almost always be accompanied by the blue-black signs of excessive heat. Simply put, these planetary assemblies with good lube DO NOT EASILY FAIL; even in the most demanding environments.

BeastWe then replace the sun shell with a new heavy duty unit  The GFX Shell, which far exceeds the factory component. The GFX Shell is able to withstand the rigors of the street, the strip, or the mud; whichever is your pleasure. No matter how hard you beat on it, THIS SHELL DOES NOT BREAK!

Next, we re-inspect the front 4-pinion planetary assembles – measuring clearances and making sure everything is within our own rigid specifications before installing it and inserting the output shaft.

SpragThe front sun gear, like the rear sun gear, is then modified for improved lubrication and installed. Then the output shaft is set for the proper end-play.

We re-inspect the input drum before installing new rubber seals and a neoprene lubrication seal. Next, we install new heavy duty overrun friction plates, A BORG WARNER DUAL CAGE INPUT SPRAG ASSEMBLY, and carbon composite forward friction plates. These forward friction plates have a superior holding capability as well as improved ability to withstand extreme heat; when compared with the OEM friction plates. Since these friction plates must hold the power of your vehicle in every forward gear, they have to be tough enough for the job.

Finally, we replace the 3-4 clutch set with 8 high-energy Borg Warner friction plates and Raybestos steel plates to avoid heat burn and coning.

Next, we install the reverse input drum for the new Max Duty Performance Wide Band. This band has approximately 20 percent more surface area for holding in both second and fourth gears. This stronger 2-4 band will hold the torque during that tire chirping shift into second at full throttle in your performance machine.

200BandWe also install the Proprietary Performance Billet Servo for maximum “apply pressure” in second gear and overdrive, providing maximum additional holding ability in 2nd & 4th gear.

Now we move on to the pump. It is inspected and modified to provide maximum lube to the planetary sets. We install a large boost valve suitable for the application. The vanes in the pump are carefully inspected for wear and replaced as needed. Steel pump rings are installed. The pump bushing is replaced with a Teflon bushing, and notches are made in pump surface to prevent its movement in even the most demanding high RPM or towing situations. This effectively eliminates front seal blow out. In addition, the front seal is installed with a special adhesive and seal retainer to eliminate any possibility of ever having a problem. The pump is the heart and soul of any automatic transmission, and we make sure it’s a healthy one. Max line pressure to between 210 and 225 PSI; which is dyno verified, of course.

The last section is the valve body. For this we use all we have learned over the years. Although most shift kits have certain distinct advantages, what we have learned is no one kit has all the best modifications… some parts we liked, others we didn’t. We took the best parts of each, and utilizing our own experience, created a set of modifications that is superior to all the others. We do not block accumulators, since the reason they exist is to prevent excessive shock to the transmission and drive train. With our transmissions, you will always have a solid, firm shift that will be linearly progressive.Sonax That means at light throttle you will feel a nice bump, letting you know the car or truck has shifted. As throttle is increased, the shifts will become more pronounced to the point of tire chirping in high performance vehicles or a firm shift at full throttle in a towing/hauling situation. It will not cause whiplash just cruising with your significant other or your grandmother around town, but will turn heads when laying it on the line.

We also eliminate the partial lockup function GM mistakenly engineered into the 4L60E transmission, thus eliminating converter shudder, premature converter clutch failure, and the well known code 1870, which causes high “line pressure”, no fourth gear, and teeth cracking shifts at low throttle. Lockup is either OFF or ON, not slipping off and on as it did with the factory PWM working. This does not affect performance, but it does have the added advantage of increasing low speed fuel efficiency, which at today’s fuel prices is like getting a bonus. In addition, this modification, along with others, allows us to use later valve bodies on older units to improve performance and increase interchangeability and reliability.


So there you have it. Our LEVEL 2 TRANSMISSION, designed to meet your needs today, tomorrow, and for many years to come!

Additional information


Please note our Warranty page. This transmission comes with a 1 Year Warranty.


This option provides you a 2 Year Warranty on your PerformaBuilt transmission for an additional $300.


If you purchase a torque converter from us you will automatically get the 2 Year Warranty Upgrade.


This transmission will support up to 700 RWHP.


A Core is Required to Build this Transmission


All units are available in either 2wd or 4X4. If you have a special application requiring a special adapter or output shaft, please contact us and we will be happy to provide it and quote a price for your special application.


If you have any questions feel free to call 1-888-744-6542, or email us at sales@performabuilt.com.

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