When putting truck in reverse 2001 yukon sle clunk noise in transfer case

If it is a four wheel drive check your tail shaft or drive line by securing the vehicles front wheels jack up the rear tires and in park try to rotate the drive line if you can hear the transmission sound like it is going into gear the transfer case could be damaged! If not a four wheel drive pull the transmission dipstick and look to see if the fluid is dark red or metallic grayish color if so then you're clutch disks inside the tyranny have been worn out and it needs to be rebuilt!

I'd look at the transfer case first.

most of the time a clunk from under the vehicle when shifting gears (whether going forward or reverse) is a u-joint. check them at both ends of the drive shaft. (possibly 1 in the middle, not familiar with your particular truck)

this sounds like the ******. if it were the transfer case then you would loose all foward and reverse gears, but since its just reverse i would say its in the ****** and also the whinning noise is very common when the pump is going bad, have the ****** checked out. good day.

sounds like the universal joints on the rear drive shaft

the jerking and noise you are experiencing is the drive chain and bearings in the transfer case also you may want to check the end play in both front and rear pinion bearings and yokes

Hi!!!! I have the same problem with mine. Did you solve it????

your u joints are gone.it is common on gm trucks,as they are a sealed unit and the needle bearings rust .there are replacement u joints available that have grease nipples on them. there should be very little play,less than 1/8 inch.

Look for dust like rust color at either U-joint, my guess is it's time to change at least one, but if I did one, I'd do other too.

The best place for a DIY manual is www.ALLDATADIY.com their info is very accurate.