A bad gear can cause your four-wheel-drive transfer case to make a clunking sound. The transfer case should be checked immediately.
Are you sure it is the transmission that is clunking? It could be the u-joints on the drive shaft that are making the noise. When the u-joints on the drive shaft are bad, there is an audble clunk when you accelerate and when slowing down (basically the same motions you go through when shifting gears).
A selenoid is activated from the rotary switch on the dash. This selenoid engages the AWD system causing the slight clunk
Check your U joints, clunking is always a good sign that they are going bad. try this, hold the brake and cycle the transmission into reverse and listen for the clunk, still holding the brake cycle it into drive. If the u joints are bad you will hear it each time the transmission engages.
The simplest thing to check would be the universal joints on your drive shaft. See if you have any play in any of those universals. The springs in the center of the clutch disk could also be out and cause a clunking. MGB's also have thrust washers in the differential that wear out and cause a clunk in the differential.
If you operate a front wheel drive vehicle, the clunking noise you hear may be a CV joint bearing going bad.
When you are in 4-wheel drive the front axle is locked so both wheeld drive regardless of traction available, if you drive in 4 wheel drive on dry pavement and try to turn, the wheels will still try to go the same speed and slip on the pavement causing a clunking sound.
you MIGHT put a little more effort into your question - details &H specifics never hurt. in a front wheel drive car, bad , loose CV joints clunk upon turning.
Buick makes a clunking sound from trans area when accelerating.
If the clunk is most noticeable at takeoff or when coming to a stop, the u-joints on the drive shaft probably need to be replaced.
sounds like transmission problems( not moving in drive) and u-joint problems(pop or clunk
could be a problem with one of the universal joints, a good way to check is to hold the brakes on and cycle the transmission from park to drive, and from drive to reverse while listening under the car. If you hear the same clunk then change the universal that has play in it, that you can check by rotating the drive shaft back and forth and feeling for looseness.
Loose universal joint(s) in drive train.