Question about 2003 Oldsmobile Bravada
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Posted on Jan 02, 2017
Try making tight turns to the right and then to the left. see if the grinding noise comes and goes. It could be your C/V joint and they need to be replaced. The noise will only come when your making the tight turns, you don't have to go fast. Walking speed will do and you can hear it with the window open or someone walking beside the Bravada. Good luck and keep me posted. Be glad to help.
Posted on Jun 16, 2009
I'm pretty sure the computer controlled NP-136 transfer case (which
uses two speed sensors to sense the difference in speed between the
front output shaft and the rear output shaft, and engages the front
axle accordingly) was installed in 1998 and later models.
These trucks (mine included) use an "Active On Demand" transfer case. Basically its a normal 4x4 transfer case with a big electrically actuated (by way of a motor) clutch that connects the front prop-shaft (which is being spun by the wheels full time) to the transfer case front output. Its all in the transfer case.
Good luck and hope this help, check all the fuses and the wire harness to the encoder motor and replace the encoder motor if it has gone bad. Try bring it to a transmission shop that is familiar with the AWD system on your Bravada. The earlier years were a different system, 1998 was when the change was made. 1997 and earlier use the Borg-Warner 4472, which is always engaged with the use of the viscous coupling. Both were marketed as "SmartTrak" though.
Sounds to me like the transfer case actuator motor is either faulty or it is being told to be on all the time (which it shouldn't be).
Posted on Dec 15, 2009
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When checking to make sure noise is wheel bearings while driving vehicle at speed the noise is loudest (if possible) turn steering wheel back and forth enough to shift the weight of the vehicle from side to side and if it's a wheel bearing there should be quite a bit of difference in the noise.
If about the same noise check the wear pattern on the tires for flat spots or unusual wear pattern if there is rotate tires. If nothing still found jack up vehicle with all 4 tires of the ground. Use jack stands for this. Get some one in vehicle to run it at speed the noise develops, I use a long screw driver (2 feet long) as a stethoscope to find where noises come from. Try with and without 4 wheel drive if possible. Good luck cause noises can be a real pain in the b____.
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