Had my 8l90 overfilled apparently

[11bravoZ71]

Just did another drain and fill on my 19 cc z71 8l90 last night. Measured what came out and refilled…. This morning I decided to do the fluid check procedure.

 

Between 95F  tranny temp and 113F on level ground I opened the overflow plug at around 104F and let drain what comes out to make sure level is correct etc.

 

2 quarts drained back out and then it came to a small drip. Been driving like this for the last at least 20k miles since I did drain and fills a couple times already before. trucks never shifted bad or anything. Found this interesting though apparently being overfilled 2 quarts.  My thermostat is flipped btw not sure if that changes anything on the procedure. 

[Black02Silverado]

Did you do the drain and fill on a hot or cold transmission?  If hot then it would be more to come out than cold and could lead to the overfill.

 

Good thing you checked it. 

[11bravoZ71]

I did the drain and fill on a hot tranny. Yup. I must have overfilled it on the previous services thousands of miles ago but didn’t realize it. So I guess I was 2 quarts over filled this long. But never had any issues luckily