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Automotive Column 39 Trans Problem

Automotive Column 39 Trans Problem

Syndicated Newspaper Column

Transmission have changed greatly over the years in the way they are controlled through electronic but the basics remain the same. They all have fluid that is directed to control the action of the transmission internals. If that fluid is not maintained early failure is possible.



Daily Car Repair and Advice Tips question 39 Transmission Failure

Dear Motor Medics,
 I listen to your show faithfully and would like your advice concerning my 1991 Silverado with a 350 V8 and automatic transmission. My truck has been sort of hovering in one gear longer than normal and reving up very high before shifting into the next gear much harder than usual. Another issue is when I shift from neutral to drive it engages very hard. I checked the transmission fluid and it was a little low but bright red and I’m wondering if anything else simple could be the problem. Also one more symptom is that when I'm coasting my torque converter is slipping and feels as though I'm in neutral because the engine just revs and only feel a pull of the motor once my RPM's match my speed. I’ve learned a lot from your advice.

Dave in Canton Texas

Dear Dave,
 I think I have an idea that you can do at home yourself. In the older GM vehicles before the days of electronic shift control there was a cable running from the throttle body down to the transmission. This cable was used to change the internal pressure of the transmission to improve performance and longevity. When under heavy throttle the transmission needs more pressure so the clutches won’t slip and under light throttle less pressure for a smooth shift. It sounds like your cable is out of adjustment. Follow the service manual procedures for adjustment and hopefully your problem will be solved.

Take care, the Motor Medics

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Advice given by the Motor Medics is for entertainment only. Each problem is different and requires different approaches and answers given here are opinions and just one possibility. In order to make an accurate diagnosis a qualified technician should make a hands-on diagnosis. Always follow all recommended safety procedures and consult with your own qualified technician before attempting repairs of any kind.

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