[ZLRob]

Originally Posted by Patriot Motorsports USA

Please see my text that you quoted. I do remove the standpipe to check fluid and while the car is running, that is literally the method I use to fill the transmission, but I am filling and draining from the plug BEFORE removing the pan. My ONLY check in this thread was stating prolifically that the temperature shared by Toto was incorrect and that due to fluid expansion at such a temperature variance above what is GM specification for our cars, would produce the exact quart if not more due to the thermal expansion of checking it using such a specification. That's it. Once again, the differences between all the pans, vehicles and such are why there is a difference in the standpipe height, but I can unequivocally share the pan that comes with the street-rod 10L90E transmission is identical to the ZLE with the only exception being the Tahoe PPV slip yoke tailshaft. We just had one here for a customer's build who is going with a carbon driveshaft in a 2017 CTSV 8spd to A10 swap.

Here is the bypass we use without a thermostat since the 2020+ ZLE A10 with an internal thermostat begins to open at 140º.

https://www.youtube.com/shorts/hp-CbrqA4OU

That's my fault. I skimmed like hell and when I combed over it quickly I read it as in you saying you didn't use the standpipe and just checked level from the side plug height level.