When you turn left or right the transfer case makes a noise and jerks . I had the fluid changer at my dealer and then drove about 600 miles.it is not as bad but the service AWD light came on at about 550 miles .the suv has 91,000 miles on it.
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ok let me tell you my problem 200 bravada acts like stuck 4wd when slow turns parking lot this is whati did and fixed it first changed fluid tract 2 / 3 times no change replaced module in right kick pnl no change replaced encoder motor no change replaced transfer case with a low mile case no change took old case apart to see what makes it tick i found out that a spring is in there to push the encoder motor back into 2wd and it was not doing its job knowing this is a common problem i took the spring out and streched it and shimed it till it pushed the encoder motor back to 2 wheel drive instaled that spring and shim into the used transfer case that was in the truck wala problem gone the spring is very easy to get at on the bottom of the transfer case is a nut remove it and the spring will come out this is only true till 2001 then the case changed on 02
this is a verry common problem with the awd bravada a tsb was sent out telling you to change the transfer case fluid to gm tract 2 fluid well let me tell you my story first i am a mechanic of 40 + years i have a 2000 bravada awd i changed the fluid 2 times like the tsb says no fix got a low mile used transfer case instaled it put the trac 2 fluid in it no fix replaced the awd module no fix so i decided to take my old transfer case apart and see what makes it tick i found out that a spring pushes the clutch fork to disingage the front drive shaft clutches the encoder moter applys the fork sending power to the f drive shaft the spring was weak and did not disingage the cluch pack THIS IS AN EASY FIX but you should replace the fluid first if it remains the same then remove the plug in the bottom and i mean the bottom of the transfer case cant miss it it looks like a tall bolt when you remove the plug a spring will come out with it i shimed my spring about a 1/4 inch PROBLEM GONE i tested this on my old transfer case on the bench first and it worked fine i also tryed streching the old spring that did not work maybe replacing the spring with a new one might also work also i would think a new encoder motor might return to rest easer then an old one this spring is what returns the encoder motor and pushes the clutch pack to 2wd
if this is a 4x4 vehilce, make sure the switch to activate the 4x4 system is in 2WD. This sound like the 4WD has been engaged. Once the 4WD is engaged and you make turns on dry pavment this tension you're feeling will happen. This is a conflict inside the 4x4 system due to dry roads, the clutches in the rear differentail or transfer case are binding. The only time you engage the 4x4 is on wet/slipperly surface.
Center differential is broken,you can test it by doing tight circles in a car park 3 or 4 to the left and repeat to the right,if it doesn't un block and it still feels like you're driving over marbles (big ones) when you turn you're sure it's the c.diff. Check tyres are all in spec.identical and same usage, right pressure.
The Bravada 4X4 system uses a fluid called auto trak, in the transfer case. The fluid needs to be changed every 50,000mi. It is a synthetic fluid that will breakdown and cause a binding condition in the system. It is easy to change so anyone can do it. Good Luck.
your problem is more than likely one of a few problems
there are two hoses on your transfer case one sucks in one blows out if one gets cloged it will go out completly so have it checked its starting.
or check the oil in the transfer case
the vehicle has to be put on a hoist. turn the driveshaft that goes to the rear wheels,it is driven by a transfer case that is almost in the middle of the vehicle,just rearward of the transmission.
if the noise comes from the transfer case,then that is the problem.
the drive shafts for the rear have universal joints which can develop play and give the same clunk.
if it is the transfer case,it needs to have a gear replaced.
always warm up the vehicle for enough time for the engine to come down to 1000rpm before putting in drive,the fast idle is over 2000rpm,and puts alot of stress on the drive components,and over time wear them prematurely.
You could be experiencing a slippage from the transfer-case as the clutch in there has to give or "slip" or drive-line binding could occur. most of the time this can be corrected just by servicing the transfer case and using the proper fluid and additive for the viscus clutches inside. The proper fluid is "autotrac fluid" from any g.m. dealer. its not cheap but must be used because of this condition. You could also be experiencing tire slipage because the clutch may not slip as it should. once again check and or service tha transfer case. To check the fluid you have to remove the "fill" plug on the rear of the transfer-case. This is the upper plug. Some are an allen hole requiring an allen wrench and some have a big hex bolt head aprox.1 1/4" in diameter. after removing the plug you should be able to feel the fluid on your finger if you stick it in there. autotrac fluid is clear in color and should not smell burn't. Good luck