Need help with my Yukon!

[rich5368]

Should be able to pull the dust cover off the bottom of the bellhousing and inspect your flywheel. I've had that happen to me before. Good luck.

 

[TheFuzz]

Doesn't sound like the flywheel to me, but stranger things have happened. My money is on the starter itself - everything mass produced gets a bad apple thrown in on occasion. Sounds like you may have drawn the short straw when you bought your replacement.