trans dipstick question for 4l80e, Lokar style firewall mount

[goatless]

FWIW, I've seen this method in 2 places, and is how I just filled mine:

From https://www.hotrod.com/articles/caus...7j90czdp_pSgU:

1. Your Dipstick Is Wrong

Most people don't realize that transmission dipsticks are notoriously inaccurate. When you take into account the length and width of most transmission pans compared to their shallow depth, it is fairly obvious that a dipstick reading that is even a quarter of an inch off can mean you are running your transmission significantly low on fluid. In a performance scenario where fluid demand can be extreme, this can cause significant damage quite quickly.

It is a good idea never to simply assume your transmission fluid dipstick is correct right out of the box. To check it yourself, put the dipstick in place, drop the pan, and make sure that the full mark is even with the bottom edge of the transmission case (where the pan bolts up). If your full mark is low, simply make a new mark on the dipstick. A simple way to do this is to use a file to make a small notch in the side of the dipstick.

With the dipstick checked and properly marked, you can now be confident that you have adequate fluid for even the most demanding driving conditions.