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1992 Sable overdrive just quit

  #1  
Old 03-05-2011, 12:05 PM
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Default 1992 Sable overdrive just quit

Hello, my 92 Sable 3.0 GS has 103,000 on it and the overdrive just quit I replaced the speed sensor but that did not solve the problem I did check for any codes and code 648 came up I think this is telling me that the car does not obtain the proper gear ratio for 4th gear otherwise the car shifts fine are there any other sensors or relays that control the overdrive? Or does it look like a tranny rebuild will be on its way?
 
  #2  
Old 03-05-2011, 11:01 PM
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All code 648 is telling you is that engine speed is too high for the vehicle speed for 4th gear which means it is not working. It could be something as simple as a bad solenoid, to major like a bad clutch or hydraulic piston problem.

I have said this before & I will say it again, there are somethings that you need to take the car to somebody who knows what they are doing instead of throwing parts at it. In your case there was nothing wrong with the speed sensor, as if there was, the car would have just stayed in low gear.

Instead of spending money on parts you may not need spend it for a diagnosis. Then you will know what to do. I understand that for some money is tight, & they want to save money by doing things themselves, but sometimes it is wise to spend the money for a diagnosis. You may find that the problem is something simple & fairly cheap.

If it does turn out to need a transmission rebuilt, you might want to think long & hard about that. That could cost almost what the car is worth if not more depending on its condition. If you really like the car & it is in good shape otherwise, just know that if you were to try to sell the car later, you will be doing good to get out of it what you have put into it. I had an 89 Buick Century that was in need of a transmission overhaul of about $1500. The blue book value was only about $2300. I sold the car as is for $500 because it needed a transmission rebuild, & bought another car.
 
  #3  
Old 03-10-2011, 02:54 AM
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I think this is telling me that the car does not obtain the proper gear ratio for 4th gear otherwise the car shifts fine are there any other sensors or relays that control the overdrive? Or does it look like a tranny rebuild will be on its way..
 
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