Over the past couple of months, I began hearing a sort of hollow, metallic "tink" when I'd start off in first. Replace u-joints thinking that might be it. Nope. My mechanic pulled the aluminum shaft (2 years old) and put in an original shaft he had. No noise. Inspected the aluminum shaft more closely and found a hairline crack at the back end kind of hidden just above the weld. Glad I found it this way instead of 70 mph on the interstate. I have advised the vendor of same.