I have to confirm what Derf posts as to what books say. What I did with mine was when I drained the transmission when changing the fluid I did what I normally do is fill gallon jugs I keep around such as anti-freeze of something used for fluids when servicing cars and I filled one completly and almost the 2nd one. Eyeballing that I used 2 gallon containers of transmission fluid to replace what was drained and that was all of one and most of the other again the in-exact method of eyeball and when I had driven he car and parked and checked the fluid level with the dip stick it looked like it was probably o.k. and maybe a little over filled.
I did change the filter which is a spin on unit. So I had better pay a little better attention to the fluid level. It is possible to have problems from over filling. How probable though I don't know. So it is better to be safe than sorry. I can read the level on mine, they are never that real easy, what is the reason you are having problems?

Findings so far
 

Greetings all,My apologies in taking so long to give an update,But I have some news that will help future questions on this issue, The car is a 2002 SL-1 first off,I found when I drained the pan to only have 3.75 quarts of fluid,remember I was having a very difficult time reading the dip stick so that's where my lack of fluid comes from.I did replace with a new filter and 4.2 quarts,again it's still very difficult to read dip stick.The car drove and downshifted much ,much better .It did give me a slight bang on downshift once instead of many times in my drive,I decided to put in a full 5 quarts instead of 4.2 which I was told was the requirement and I have not since experienced and harsh up shift or downshift. At this point I consider it a repair.Thanks to all and I hope this will be helpfull to anyone else with similar issues.