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Why is my overdrive not working on my 1965 Jaguar 3.8S

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  • Patrick Jansen
    Patrick Jansen May 16, 2017

    Hi Paul, I already drained the gearbox oil, but the problem persist, if it is an electrical problem, where should I start looking, because I suspect it could be electrical?

  • paul fairbanks May 17, 2017

    start at the relay checking for battery power with ignition on at the green or pos purple wire if ok the relay should click when overdrive activated check the resitance of the solenoid to make sure its ok and check the wiring a schematic would be a good help if you can locate one

  • Patrick Jansen
    Patrick Jansen May 18, 2017

    Thank you so much for your advice, I am taking the car to an Auto Electrician today to apply your professional guidance and will let you know if we managed o solve the problem.

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  • Jaguar Master
  • 645 Answers

Sounds like a electrical problem but could be the little oil pump in the overdrive. first check the solenoid on the overdrive unit is being turned on with ign on. in 3rd or 4th gear use a test lamp or similar. the most likely cause is the switches on the gearbox that will not allow the overdrive to function in the incorrect gear. but could be the pump stuck or blocked filter

Posted on May 16, 2017

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