Question about 1993 Chevrolet K1500

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I have a 1993 Fullsize blazer and i have lost the overdrive a

And drive gears, but 1st and 2nd are just fine. Do i need to rebuild the tranny? or someone mentioned the ''modulator'' valve?? what is that?

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  • Anonymous Nov 29, 2008

    my issue is simular, 1993 silverado 4x4, trans fuse under dash blows as soon as i turn key on, and no over-drive, if i start it and the fuse doesnt blow it shifts fine, iv replaced tranny, put new filter, new selinoids, and went over wiring in trans. and speed-o and tach go crazy from time to time also. i know when this kind of problem occures in a 99 f-250 it is the speed control sensor in the differential, is there any simularities? any help please????

  • Tony Rodriguez May 11, 2010

    Hi, can you be more specific???

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THIS MOD HAS NO MODULATOR IT IS SHIFTED BY ELECTRIC SOLENOIDS INSIDE TRANS MOUNTED TO VALVE BODY CONTROLLED BY DOES THE SPEEDOMETER WORK ASK FOR A REASON SOME MODELS SHIFTED BY BUFFER CONTROL UNDER DASH WHICH SENT VOLTAGE TO PCM TO SHIFT WORTH A LOOK INTO

Posted on Nov 27, 2008

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