Looking at the Laycock Overdrive is a challenging task due to the fact there is not a lot of information about them and that it is a 50 year electronic hydraulic gearbox. The first step I took was checking for continuity in the wiring and solenoid. After confirming that all the electrical systems were working on the overdrive including the 4th gear only switch and reverse switch. Once it was established that the electrics were working properly I moved on to fiddling around with the various plugs and screws on the casing of the overdrive I was able to drain the oil and open the service door for the oil/hydraulic fluid filter. The filter looked fine so I cleaned the gasket, door and screws and reassembled the filter housing. The second service door, for the solenoid switch mechanism that engages the hydraulic pump which kicks the gearbox into overdrive with a planetary gear set, was removed. I hooked the overdrive up to a 12 volt battery and placed the transmission in 4th gear then completed the circuit. The result was the solenoid engaged then you could see the arm move to engage the pump. Good news the overdrive is working properly! All that is left is to refill the overdrive and transmission with fluid and it is ready for business.
The next job on the transmission is the shifter linkage and gaskets along with paint. It is a pretty simple tear down of the linkage and one all the bolts, shrouds, and bearings were removed a quick wash in the parts washer cleaned them all up. The next step is to reassemble to linkage with new gaskets and shifter boot. Compressing the spring and tightening it up was difficult but can be done with two people. The transmission is ready for paint.
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