84 camry dlx model hatchback

Hello to all on the forums 1st off......
I need some help here on my 1st generation 84 Camry hatchback deluxe model automatic transmission.
THE PROBLEM(S)
To be clear on the problem I am having is this: My transmission is shifting hard and rough intermittently and sometimes when going between the speeds of 40-55 mph I will feel a shake and cluttering from the transmission or the axle going into the transmission. Note the car does not do this all the time just sometimes. The car just started doing this so I am sure it will get worse. Also to be noted the car shifts rough when coming to a stop so that would be downshifting from 2nd to 1st at about 15 mph. Also when I took a long road trip some of the transmission fluid would spill out I am guessing it was coming from where the axle meet/goes into the transmission. When this happened (happened more then 3 times) I would have to check and add transmission fluid to the car to get it back up to the full level.
WHAT I ALREADY DID TO TRY AND FIX
I have already taken it to 3 different mechanics and they all said to drive the car until It breaks and then junk it. That REALLY PISSES ME OFF AS I LIKE THIS CAR VERY MUCH AND WANT TO FIX IT. The 1st mechanic sucked 2 quarts out of the transmission dipstick and then added Lucas stop slip and told me to drive the fucking car and see if it helped. It seemed to help at 1st then the hard shifting was back in no time at all. I did check the transmission level and it is at full when the car is hot. One of the other mechanics knows the issue(s) on this car and was telling me to check the transaxle fluid behind the transmission pan. I went behind there and there is 2 plugs 1 filler plug to train (I am guessing gear oil?) and the other plug is a drain check plug. So I looked up the fluid type in my owners manual for the filler plug behind the transmission pan and it says to put in the same type of fluid as in the transmission is this correct?
QUESTIONS AND HELP NEEDED
So my 1st question is why would I put the same fluid type (dextron2) in the transaxle filler plug? I would think I different kind of fluid like (gear oil) would go in there as it is a completely separate compartment then the transmission dip stick and transmission pan and filter? What is the correct type of fluid to use in this separate compartment?
Being on these big forums there must be several people who know about this problem and might even be having the same problems. Please let me know what is causing this and what I can do to fix this. I really would appreciate any/all help from you as I know the forums are a great way to share and help each other with information so thanks to all who help in advance.
Dave

if it calls for atf in the 3rd member i would use it, most automatic fwd cars don't have a separate fluid reservoir for the ring and pinion section, they all just run of the same atf fluid in the pan. sounds like one of your sensors in the transmission is not working right, depending on what tranny is is it may have a transmission control computer by the radio that could be acting up. if it only does it after it warms up you might try a separate tranny cooler that mounts in front of the radiator and unhook it from the stock cooler. also if you go to a tranny shop not a regular mechanic they are more likely to be able to tell you if its a bad sensor or solenoid sticking

The car has 97k original miles on it. I drive it everywhere so city and highway. Last transmission flush was 70k.
I bought the car from 1 owner original miles on it at 60k.
So you can see why I want to keep and fix the car.
Little to no rust just a little in the back of the car near wheel well expected at that area.

My ?'s to you guys are as follows:
If the car is jerking/shifting hard-rough from 2nd to 1st and spitting out some of the tranny fluid some how then why/how could changing the fluid help?
I mean if its going bad then it will fail soon with old or brand new fluid correct?
If so f............. it what's the f........... point I will drive it till it drops.
We already sucked out and changed part of the fluid to add the lucas 2 quarts in there.
The mechanic said leave the fluid in there b/c it looks so clean/new.

You may have a sticking solenoid or valve in the valve body. Bring it to a transmission shop and get a real diagnosis. See if you can get a recommendation from a friend so you don't shop blind for a transmission mechanic.

Well another thing I can try I notice today but I need to test it more is this:
When the car shifts rough from 2nd to 1st when the trans is hot only its in NORMAL MODE. SO I tried it with the O/D OFF MODE and I think it did not do it not sure b/c I was falling asleep at the wheel on the way home from work today so I will have to try it again tomorrow. TODAY WAS SHIT DAY HOPEFULLY TOMORROW WILL BE A BETTER DAY.....