SOURCE: 1993 Chevy Silverado
Replace the vehicle speed sensor, it's located in the tailhousing of the transfercase
SOURCE: vibration noise on 1999 chev silverado 1500 4.3l
Have you checked the u-joint yet? i had what sounds like a similar problem to yours and thats what took care of it for me...
SOURCE: grinding noise while driving.
Possible causes:
a) a brake disc shield is too close to the disc, and it's coming into contact in the circumstances you outline
b) pebbles stuck between the disc shield and the disk
c) dried out wheel bearings
d) worn Universal Joints in the drive shafts
e) worn A/C pump
f) worn alternator
g) worn water pump
Is the noise still present above 15 miles an hour and past 1500 rpm when the clutch is disengaged (i.e. gearbox in neutral?). The answer to this question may help you to pinpoint the source. I know it's stating the obvious but the fact that you're hearing a grinding sound means it's caused by something that is moving relative to something else. Again this should help narrow down the cause.
SOURCE: My 1996 S-10 Blazer will not shift sometimes and
A faulty VSS (Vehicle Speed Sensor) or related wiring can cause both of your problems, trans and ABS. If the computer doesn't know the vehicle is moving, then it won't shift the trans. If the ABS controller sees wheel speed, but not vehicle speed, it will turn on the ABS light. The VSS is located in the rear transfer case housing. But remember, it may be the VSS, related wiring, a faulty speedo buffer (usually located in the dashboard), ECM, or even the reluctor on the transfer case output shaft. You may want to have a shop scan "data stream", or even have them diagnose the problem.
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