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Old 12-04-2011, 07:52 AM
RRPhil RRPhil is offline
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The torque converter lock-up clutch in your 5HP24 is designed to spend the majority of its time constantly slipping unless you’re cruising at steady speed on the highway. To maintain a constant slip rate (around 2-3%) the LUC piston is fed a hydraulic pressure which is proportional to engine torque. If your engine is tuned (the transmission was originally designed for a maximum of 440Nm input torque) then clearly the PWM duty cycle on the proportional solenoid that supplies this pressure (shown in photo below) will be that much higher and the LUC will have to work that much harder to maintain constant slip. You could maybe try swapping the torque converter lock-up clutch solenoid with one of its three identical neighbours (labelled A, B & C below) to see if the DTC changed at all ?



but at that mileage it probably would be sensible to replace the converter anyway. Was anything done to uprate the transmission when the engine kit was fitted (increased pressures, etc.)?

2-1 downshifts on the 5HP24 should be seamless as the engaging element is a mechanical sprag and not a clutch.

Phil
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