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06-01-2009, 09:17 AM
| #1 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
 | slipping tranny My tranny will slip or not shift out of gear intermitently all of a sudden. Whenever it happens the speedometer will not work or will bounce around. If I stop the truck and shut it off for a couple seconds it seems to be fine, sometimes still stuck in first or second, sometimes not. I've had the truck over a year now with no tranny problems till now? Could this hopefully be something electrical like a sensor? Thanks.....Matt
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 09:31 AM
| #2 |
| Senior Member Join Date: Aug 2008 Location: williamsburg virginia
Posts: 200
| scan the codes and see whats going on.could be a speed sensor.is the mil light on? |
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06-01-2009, 09:35 AM
| #3 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
| The service engine light is not on, and I've never seen it come on. I checked the codes anyway and there were none.
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 09:38 AM
| #4 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
| If it is possibly the speed sensor, which one is it? Is it the one on the back end of the transfer case kinda on the top with two wires?
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 09:46 AM
| #5 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
| I just re checked the codes. Codes 12 and 72 are there. Anyone know what they are, I can't seem to find my book all of a sudden. 
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 09:52 AM
| #6 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
| Code 12 should be there cause I'm doing a test, and according to the world wide web code 72 is VSS signal circuit error. So would that be vehicle speed sensor? If that's it, and it the two wire one on the end of the t case I have an extra t case I could try switching the sensors.
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 09:53 AM
| #7 |
| Senior Member Join Date: Aug 2008 Location: williamsburg virginia
Posts: 200
| code 12 i think is system pass. 72 is speed sensor. {i dont have a book}i believe it is. |
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06-01-2009, 09:55 AM
| #8 |
| Senior Member Join Date: Aug 2008 Location: williamsburg virginia
Posts: 200
| try the other sensor. that should fix your problem. |
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06-01-2009, 10:23 AM
| #9 |
| Senior Member Join Date: Feb 2009 Location: Okauchee, WI
Posts: 60
| I just switched the sensors and went for a kwik test drive and all was good. Hopefully that was it. I didn't re check codes, but so far so good. Thanks again.....Matt 
__________________ '94 Chevy Silverado Z71 Xtra cab 4x4 350cid 4l60e auto |
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06-01-2009, 10:26 AM
| #10 |
| Senior Member Join Date: Aug 2008 Location: williamsburg virginia
Posts: 200
| no problem. hope that fixed it. you might want to reset your computer though. its keeping that code stored. clear the codes and drive on. |
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