1997 Chevy S-10 6 cyl Four Wheel Drive Automatic 174000 miles
I have a driveline noise when decelerating from ~35MPH and above. When I am driving along and I take my foot off the accelerator, once the RPMs drop to around 1000-1200, I will get a rumbling/grinding noise from the center/rear of the truck. It resembles the sound a playing card makes in bicycle spokes, but a bit deeper. If I just TAP on the gas to raise the engine speed even just 50RPMs, the noise will go away. I get no noise when accelerating or when maintaining a higher engine speed. I have noticed that the activation RPM increases with vehicle speed. For example, at 55MPH, the sound appears when the engine is at about 1250-1500RPM or below, but not above that.
I have the G80 Posi-Traction Rear End which has brand new LSD-Approved oil in it.
The transmission shifts fine with no flaws.
The Universal Joint was replaced about 3K miles ago.
This only happens when the car is moving.
This problem has only revealed itself a few days ago.
Tuesday, November 4th, 2008 AT 11:04 AM