1999' Z71 Automatic

**10sec302** · 03-13-2007, 08:51 AM

Brand new to this site guys, but I have a QUESTION:

I have a buddy who has a 99' Z71 Chevrolet and he said after he backs up, he shifts the truck (automatic) from Reverse to drive, he's hearing a crackling noise that sounds like it's coming from the rear end. We considered changing the U-Joints, but we're not sure if that's what it is. There's no play in the drive shaft and he said it doesnt sound like it's coming from the transmission. Once the truck is in drive he said he hears it click about 2 times, and then the trucks fine. There's no vibration going down the road so we don't assume it's the drive shaft U-joints.

And suggestions???

Thanks.

**Orcus79** · 03-13-2007, 12:28 PM

u-joints bud, you won't get play from them all time. Pull the drive shaft to get the load off of them and check them really good.

**10sec302** · 03-13-2007, 12:42 PM

Well we climbed under the truck and I rotated it, and I got the normal 1/8th inch of play each way, but I took it and tried to push up on it and shake it and I got nothing.......Hmmm.

**Orcus79** · 03-13-2007, 12:49 PM

having done many a ujoint on my old truck, you won't be able to confirm it till you pull the shaft. I didnlt know the joints on the front sfat were bad till i pulled it. on the rear shaft the only way i knew was the noise.

Pull off one end and rotate the cups to find it. When you get play with it attached they are about ready to fall out. usually if catch it early it will only be one or two bearing set have turned to powder.

**10sec302** · 03-13-2007, 01:04 PM

Originally Posted by Orcus79

having done many a ujoint on my old truck, you won't be able to confirm it till you pull the shaft. I didnlt know the joints on the front sfat were bad till i pulled it. on the rear shaft the only way i knew was the noise.

Pull off one end and rotate the cups to find it. When you get play with it attached they are about ready to fall out. usually if catch it early it will only be one or two bearing set have turned to powder.

Sounds good, thanks for the advice........