Question about Cars & Trucks
This is not a good practice. The tyres are obvious different sizes to the rear tyres either in construction ( example 185 95/15 as to the rear sizes 185 50/15-- the difference of 45 means that the circumference is smaller and therefore travels less distance for the same revolutions. ) or they have less tread left on them than the rear tyres which means that the distance they travel per revolution will be greater or less than the rear tyres. This variation means that the diff between from and rear drives is now turning and the sensor is picking that movement up and displaying as the service light The only difference allowable when fitting different tyres is the tread pattern and even then both wheels on the same end have to be the same tread pattern.. When using second hand used tyres you have to be very careful in selection as any old thing will cause you grief. I would say that it is not what they did but what you selected for the job.
Posted on Nov 23, 2014
If the tire diameter is different from the rear
Used tires will be worn & smaller
If that is AWD--- it won't work,need 4 tires the same
Same brand,same tread,same amount of wear (dia)
They also could have caused a problem with sloppy work
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
i got a 98 bravada and my AWD light was on, what i did to fix it was replace the transfer case motor and thats all, i did a bunch of research and found out that the transfer case motor is the main conponent with of your AWD it tells the transfer case when to give the front wheels power. try replacing that
Posted on Sep 17, 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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