Project Carbon® AS68RC High Pressure DIY Valve Body Upgrade Kit - V4.0

Next Gen Drivetrain, Inc.


     The AS68RC is riddled with highly expensive problems that largely derive from a couple of leaky valves and a set of utterly useless accumulator pistons. This dinosaur of a transmission can be traced back to the Toyota Land Cruiser of the mid 80's and was never designed to accommodate the arduous demands of the diesel crowd.

     As always, Next Gen Drivetrain™ best-selling drop-in Project Carbon® DIY Valve Body Upgrade Kit are the driving force in providing efficient and inclusive solutions to these evolving transmissions. This kit addresses both the leaky valves and the accumulation leaks with this kit, even going so far as to include drop-in sleeves to replenish the clutch control valve bores with NO machining needed! This kit can also be configured with a high pressure spring that increases line pressure in all forward gears by up to 25%, NO tuning required!

Aisin Seiki AS68RC Product Resources:

- AS68RC Transmissions
- AS68RC Torque Converters
- AS68RC Rebuild Kits
- AS68RC Valve Bodies
- AS68RC Parts

Popular Transmission Information Resources:

Top 5 Benefits of an Upgraded or Built Transmission
Calculating Torque Multiplication Factor, Why is it So Important?
Top 5 Ways to Extend the Life of a Factory Transmission


Difficulty Level: 6 out of 10

Install Time: 3 hours*

 *This kit comes with very easy to follow instructions and visuals to help you install the product as efficiently as possible. If you run into any questions or hang-ups, just call in and ask to speak to an expert!

Frequently Asked Questions:

Q: Does the Project Carbon® AS68RC DIY Valve Body Upgrade Kit require a quick-learn or TCM Tuning to be done after install?

A: Absolutely not, just plug and play! You can use a TCM tune to increase line pressure, allowing you to get the most out of the kit, but it is not necessary to run the kit.

Q: Will this kit cause aggressive or banging shifts?

A: Nope! This kit will tighten shifts up slightly, but not to the point of being unsavory or aggressive. You will be pleased to notice quick, crisp, seemless shifts that you wish you would have gotten from the factory. We do this by closing the crossleaks found in even brand new OEM valve bodies, allowing clutches to turn on immediately when commanded.

Q: How does this product compare to other AS68RC valve body upgrades on the market?

A: There is simply no comparison to other valve body upgrade kits on the market. Unlike other kits comprised of cheap, foreign-made parts that leave most problems unresolved, and worse, could have been pieced together yourself for less, this kit is 100% engineered AND manufactured in-house by Next Gen Drivetrain. Aside from seals and fasteners, all of these parts are designed by, and made by us. No expense was spared in the development of the best AS68RC valve body upgrade kit on the market.

Q: I have low miles, should I wait until the vehicle has more mileage to run this kit?

A: No! This kit prevents the degradation and decay of countless internal parts that cause expensive failure. The best time to install this kit is when the vehicle is newer, before damage and decay has taken place.

Q: I have high miles, is it too late to benefit from this kit?

A: Also no! High mileage vehicles will benefit even more from this kit because they often have significant wear to internal components such as clutches and valves. This kit will restore and enhance hydraulic integrity to all of these functions, breathing new life into the transmission and adding to it's lifespan.

Q: I may rebuild my transmission in the future. Would that make this kit a waste?

A: Absolutely not! These parts are dramatically over-engineered and can be reused until the end of time. If you need to rebuild the transmission, you can reuse all of these parts. Even the seals generally do not need changed. If purchasing a Next Gen Drivetrain transmission, we can remove 100% of the cost of the kit from the price of a transmission. This kit can only help you.

Q: How easy is this product to install?

A: This product is very easy to install. Anyone who can follow basic instructions and has access to a relatively clean workplace can install this product right at home. Best of all, ALL Next Gen Drivetrain valve body upgrade kits install WITHOUT dropping the transmission. These kits include detailed instructions, but if you get stuck, we will personally walk you through the installation by phone.

Q: Is there any downside to installing this kit in my vehicle?

A: None. This kit provides a huge reliability AND drivability improvement for the price of a basic tune-up. Best of all, if installed in a vehicle that is currently in good working order, our valve body upgrade kits can often prevent the need for a transmission rebuild in the future for the average person altogether.

You can expect:

- Much better shifting

- Tremendously increased longevity, resolving the dreaded B1/B2 leakage issue!

- Better clutch control

- Fixes crossleakage better than any other DIY kit on the market 

- Cooler Operating Temperature

- Fixes problematic Line Pressure Bleedoff issue at High Heat/Pressure

- More Line Pressure

*For those who are not in the market for our complete and ready to install valve bodies, this is the perfect DIY solution that ANYONE can do, and is designed to address the major failure points of the AS68RC once and for all.*

This kit consists of:

- 2 Billet Control Valve Sleeves

- 2 Billet Anodized Clutch Control Valve Plungers

- Laser Cut Upper Valve Body Separator Plate

- Laser Cut Lower Valve Body Separator Plate

- Upper Valve Body Paper Gasket Set

- Lower Valve Body Paper Gasket Set

- Forward Planet Retaining Stud Kit (Installs with Valve Body Removed)

- All Necessary Hardware

- Pressure Regulator Valve Recalibration Spring


     If you’re looking for a DIY solution to your AS68RC that does not require a transmission drop, tremendous shop labor costs or going broke, there’s is no better product than our Project Carbon® AS68RC High Pressure DIY Valve Body Upgrade Kit. This bestselling product is easy to install, affordable and delivers huge improvements to the AS68RC at any mileage or rebuild. If you still have questions, we encourage to call in and speak to one of our experts!