TCC Modulator sleevekit 4R44E, 5R55R

TCC Modulator sleevekit 4R44E, 5R55R Sleeve Spacer Solenoid Regulator Valve Spring Constant oscillation of the torque converter clutch (TCC) modulator valve creates wear in the valve body bore, which can allow converter solenoid oil to exhaust. This prevents the TCC modulator valve from stroking fully to the apply position, which can create a no lockup complaint and/or set a 1741 code. Wear at the other end of the valve can prevent TCC release, resulting in cover dragging and stall on forward engagement. Specially toleranced alloy aluminum sleeve is significantly more wear-resistant than the cast aluminum valve body. Alloy aluminum sleeve provides more contact surface with the valve for increased stability and durability. Kit includes a replacement solenoid regulator valve spring, which is often damaged during valvebody disassembly. The tool kit also works with the 37947-05K pressure regulator valve sleeve kit. Symptoms: Code 1741 Engine stall on FWD engagement Low cooler flow No lockup Poor converter fill & delayed engagements Cause: The modulator valve bore wears at either end or can stick in either position. Fluid control at the inboard circuit prevents lockup valve travel in reverse. The outer circuits affect converter flow and TCC apply through the solenoid. Correction: The Sonnax sleeve reduces cross leakage and improves TCC solenoid control over the valve and apply oil. Required tool: 37947-TL5