There is one available.
Quote from the repair manual;
"The transmission Oil Dipstick 9336 has indicator marks every 10mm. Determine the height of the oil level on the dipstick and using the height, the transmission temperature, and the Transmission Fluid Graph, determine if the transmission oil level is correct."
Another couple of quotes from the SM;
"The dipstick will protrude from the fill tube when installed.
"Warm up the transmission, wait at least 2 minutes and check the oil level with the engine running.
Push the Oil Dipstick 9336 into transmission fill tube until the dipstick tip contacts the oil pan and pull outagain, read off oil level, repeat if necessary."
One of the keys to using it is, that you need to be able to monitor the transmission fluid temperature. The reading on the dipstick will vary quite a bit with every 10 Deg. warmer or cooler.
Trany fluid Level 42rle
Without a scan-gauge tool it would be difficult to determine the temperature of the fluid.
However, if I had an automatic and the fluid level was somewhere in the upper-mid to upper range on the dipstick, once the transmission is warm, I would be comfortable with that.
On level ground of course.
But I must caution anyone about doing this on your own. I have merely supplied some information and my opinions here.
I am not responsible for how you use this information, or any possible damage that may occur from you not servicing your vehicle properly.
Now if someone were to get a dipstick, have there trany serviced by a dealer, and then imediatly check the level. We would have some "Real" numbers to go by...