UZZ3x Tranny

[krayn]

I converted my a341e trans to a slip yolk type. Had to swap over the speed sensors in the extension housing to the 4 pulse rev two wire sensor. The extension housing I got had provision for a cable speed sensor, so it made it a sinch to get my analog speedo working.

 

[Toymanf]

The following is quoted from the 1991 Lexus ls400 svc manual:​

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"Hydraulic Control System​

The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accumulators,
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the clutches and brakes, as well as the fluid passages which connect all of these components.
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Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hydraulic
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pressure acting on the torque converter, clutches and brakes in accordance with the vehicle driving
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conditions.
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There are four solenoid valves on the valve body.
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The No. 1 and No. 2 solenoid valves are turned on and off by signals from the ECU to operate the sift
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valves, and change the gear shift position.
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The No. 3 solenoid valve is operated by signals from the ECU to engage or disengage the lock-up clutch
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of the torque converter.
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The No. 4 solenoid valve is operated by signals from the ECU to control the engagement speed and reduce
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gear shift shock."​

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My 1991 ls400 trans has a throttle pressure cable as well as an accumulator pressure solenoid. As I understand it, the "4th solenoid" is the accumulator pressure control solenoid. This solenoid is pulse width modulated giving it the ability to vary the amount of change in shift quality/speed.​

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Frank​