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93 GMC speedo quit,brake light on & trans wont shift out of 1st George 3-24-12  
It was running fine no problems, went to start it to go somewhere and my brake light was on, speedo did not work and trans will not shift out of 1st gear (All three happend at the same time) I changed the vss but that did not fix it. what else could it be? the trans is a 4160e. the truck starts fine. Its a 93 gmc sierra sle ext cab c1500
Thank you
Re: 93 GMC speedo quit,brake light on & trans wont shift out of 1st BUBBA THE BUS TECH 3-26-12  
It sounds like you have a power supply problem or your drak has gone bad.
The drak is a little black box, usually under the dash that the VSS feeds it then distributes and adjusts the Signal for each component. Speedo, trans computor, Antilock, etc.
Check fuses first.
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