Heavy Duty Valve Body Kit | 4 Speed RC Colorado Isuzu DMax A340

🚗 Suitable for

• Holden Colorado RC (2008-2012), 4 Speed Auto

• Isuzu D-Max (2008-2012), 4 Speed Auto

• A340 4-Speed Automatic Transmission only

📦 What’s in the Kit

• USA-made hardened steel TCC relay boost valve & bushing

• Blue & Orange pressure regulator valve springs (with washer)

• USA-made hardened steel 1-2 shift valve, ball, pin & rivet

• Red, Blue & White cut back valve springs

• Short, Medium & Long accumulator spacers

• Full set of accumulator springs (Blue x2, Orange, White, Red, Plain)

• (5) Drill bits

• TransGo sticker

⚡ Performance Benefits

• Converts the standard A340 valve body to heavy duty specification

• Handles increased torque from engine upgrades & towing

• Firmer, shorter shifts for better drivability and durability

• Stronger clutch plate engagement, reduces slip and overheating

• Restores hydraulic integrity with hardened steel replacement parts

• Extends transmission life under higher power loads

🛠️ Fitment Details

• Transmission does not need to be removed for installation

• Direct fit upgrade for A340 4-speed automatic

• Suits performance builds, towing setups, and off-road applications

🔧 Why Upgrade?

The factory A340 valve body is a weak link when power and torque are increased. Without reinforcement, soft shifts and clutch slip lead to burnt plates and shortened transmission life. This TransGo Heavy Duty Valve Body Kit recalibrates accumulators, pressure regulation and feed orifices, ensuring your transmission can handle heavy towing, performance tuning, and off-road use.

❓ FAQ

Q: Can I install this without removing the transmission?
✅ Yes, it can be installed with the transmission in the vehicle.

Q: Does this suit the later 5-speed autos?
❌ No, this kit is only for the A340 4-speed automatic transmission.

Q: What driving styles benefit from this kit?
👉 Towing, off-road, work trucks, street performance, and hot rod applications