145,000 on my bone-stock 4L60E. Only engine mod is a lid. That thing still grabs all gears like new!

 

Vert had 206k before I stalled it and killed it...

 

I put 280k on a 700R4 which is basically the same trans.

 

Mine just took a dump at 188k miles. It has had a stall in it for roughly 40k. I have taken it to the race track many times and it was driven like a race car daily. I kept the fluid and filter changed, and run a RV trans cooler.. If an auto is dying below 100k miles with mild modifications then it has either not been taken care of or the tuner "tuned it to death" meaning they ramped up line pressure too high yadda yadda.

 

237,000+ in a 2002 4.8 rcsb, and only got 110,000 on our 2000 5.3 Yukon.

 

I'm glad to see that the 4l60e tranny is more reliable than I first read. I just passed 67,000 miles, and it still feels strong. No laziness in the shifts, 1-2 is very snappy, almost wonder if it has a shift kit in it, or if they came that snappy from the factory.

 

Mines took a dirt-nap at around 86,000 miles. SMH...