Description
4R70W Transmission and Torque Converter
Our 4R70W transmission is built with premium, performance-enhancing upgrades designed to dramatically improve durability, reliability, and shift quality. Every unit comes with a six-plate direct clutch and four-plate intermediate clutch pack, significantly increasing torque capacity and resistance to wear. We’ve updated critical components including the EPC solenoid and solenoid clips for improved response and long-term operation. Each transmission is equipped with a new boost valve kit, pressure regulator valve, bypass converter clutch slave, and plunger assembly to eliminate common issues such as delayed engagement, shuddering, and soft shifting. A known OEM design flaw involving the spiral lock snap ring and staked retainer has been fully addressed with upgraded components to prevent premature failure. In addition, 1-2 and 2-3 accumulator pistons have been redesigned to reduce harsh shifts and extend clutch life.
Every 4R70W includes a precision-installed overdrive servo pin sleeve, completed using our custom tooling and bushing process to ensure long-lasting performance. The front pump is fitted with new line bore bushings, enhancing fluid flow and eliminating leaks. Late-model 4R70W units also feature a 3/4-capacity valve sleeve and an extra-thick, zinc-coated separator plate, designed to withstand stress and prevent cracking or cross-leaks, especially common near the 1-2 accumulator piston spring retainer. For high-demand applications, such as police, and towing vehicles, this transmission includes a heavy-duty direct clutch pack, upgraded valve body modifications, and an elevated pressure regulator valve to maximize holding power and shift precision under load. Heavy-duty bushings are also installed to improve internal fluid control, pressure balance, and overall efficiency.


Includes Performance
Grade Torque Converter
Our torque converter upgrades are designed to address common OE wear points and help reduce vibration, premature bushing wear, and seal leakage.







