[87Skier]

My 4L60E has been squeaking for a while. Turning the tires with the rear end off the ground or running the vehicle it is clearly audible, and it sound likes it is in the rear half of the transmission.

I thought the output shaft snap ring failed, but when I removed the transfer case, the shaft felt solid and wouldn't move more than 1/8".

So, what is likely wrong with this 4L60E? It is a 1997 model with I suspect about 250,000 miles. Not sure how many on the rebuild though. I've read that sometime a rear planet will cause the squeak. Any thoughts?