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  #1  
Old 12-29-2008, 07:18 AM
 
Join Date: Aug 2007
Posts: 13
Default 97 sierra 3500 speedo/shifting problem

Hello guys
I have a 1997 gmc sierra 3500/454/4l80e. It has started shifting erratically and also has not been indicating speed correctly. torque converter lock up is cycling. I changed trans filter/change fluid. Scanned for codes, no powertrain codes up. I jacked up truck and ran up to speed speedometer still not indicating correctly. I put DVM on transfer casespeed switch and it appeared to read correctly
ac voltage increased with wheel speed about 600 mv@ 45 mph. I have nothing to compare that to,also my manual shows two VSS, one also on transmission but the component I think is it has different color wiring . Anyone know what /where that sensor is? thanks in advance Cort
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  #2  
Old 01-03-2009, 08:04 PM
 
Join Date: Aug 2007
Posts: 13
Default RE: 97 sierra 3500 speedo/shifting problem

well I replaced both vss and still no fix. no codes up but still ****ting all over the place and speedo still not right. I am thinking PCM any ideas ...any one. Come on throw something out there thanks cort
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  #3  
Old 01-03-2009, 08:59 PM
 
Join Date: Dec 2007
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Posts: 214
Default RE: 97 sierra 3500 speedo/shifting problem

try posting in the chevy silverado area, there are more guys that browse over there
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  #4  
Old 01-06-2009, 02:48 PM
 
Join Date: Aug 2007
Posts: 13
Default RE: 97 sierra 3500 speedo/shifting problem

thank you !
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Old 01-06-2009, 02:48 PM
 
 
 
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1997, 3500, 4l80e, 97, erratic, forum, gmc, indicator, problem, problems, shift, shifting, sierra, speedometer, working

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