Question about 1990 Buick Skylark

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Transmission shifts hard

My car was running hot after finding that problem--radiator cap and heat sensor ---the transmission started immediately as soon as we put on new parts shifting hard -we unplugged the speedometer now it shifts fine what is wrong????

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  • diane11400 Sep 02, 2008

    thanks for advice what do i ask for at parts house ? can we relace this ourselves?

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Your car has the 125c/3T40 model trans,3 speed automatic with lockup.When you say you unplugged the "speedometer",if you are referring to a square electrical connector on the trans,facing the radiator,that connector is not the speedometer,but the lockup circuit inside the transmission.It is likely the lockup solenoid inside the side pan has gone bad and is malfunctioning.It is a common problem on those transmissions.You will lose some gas mileage by unhooking the connector,and eventually,years down the road,will hurt the trans from the fluid running too hot.Lockup clutch application in a General Motors lockup torque convertor helps to cool the fluid.

Posted on Sep 02, 2008

  • David Fleming Sep 02, 2008

    The TCC solenoid (Torque Convertor Clutch) is located on the driver side,behind the side pan on the transmission.It is fairly involved process removing the sidepan,sometimes requiring removal of the chassis on that side.The actual parts required are the TCC solenoid,and a new gasket for the sidepan.A transmission shop should be able to order the parts for you.Good luck.

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