Transmission seal leak... the leak is on the right side of the trany pan. do i just take the pan off then replace the seal?

May need a new bushing in the pump that supports
the converter hub
The new or rebuilt converters don't have very good tolerance
on the hub,they run out
May have to take converter to a shop that does
their own rebuilds on converters, to have hub checked
for run out.They do much better work then say Daco
or other big names in the converter rebuild arena

it must be coming from one of your seals there is two inner ,and outer seal ,jack car up and check if is leaking on the front ,or rear of trany ,also check for tightness on screws around the oil pan good luck

the transmission is sealed so you shouldn't have to add fluid unless there is a leak find the leak first to add fluid there is a bolt on the right side of the trany i think that's where you add the fluid but you will have to use a pump because of the angle.

there is a small filler neck in frt. of the trany , with red cap on it. Brake the cap , there will be a plug under.
Proccedure : engine on idle , take of plug at the bottom of trany oil pan(with engine on idle!!!!! , if engine off , fluid will leak out) , use transfering pump to pump oil in to filler neck untill it starts leaking from bottom plug , wiat till it only drips , put bottom plug back in and torque it. Now you can shut engine off and seal filler neck.
Use only approved trany fluid .This trany takes syntetic fluid.

It is NOT the transmission pan gasket or bolts ?
You have 2 trany line coolers, 1 fill tube, and the tailshaft seal, all could be culprits.
I would say clean the botton of the trany pan off completely, and see if it leaks WITHOUT the truck running.
Then start the truck and see if it leaks, if not, then put it in drive, and see if it is leaking.
Please let me know so I may help you further.

I would pressure wash trany down, make sure it is clean. Drive car at highway speed. Now inspect trany and see if you find the leak, one thing you did not say you changed was trany pan gasket, also look at trany cooler lines.

bottom left is drivers side. ck hoses, heater hoses. maybe a pressure test may show where the leak is.

The leak is coming from the pan ??
Maybe the leak is traveling to the pan seal area from somewhere else ?
Did you scape off the stuck-on old gaskit on trani and pan ?
Its customary to use gaskit sealer on both sides of the new gaskit..

I hope they didnt over fill it when they did the seal a few months ago..

Did the mech say what would cause the overflow ??

Maybe call a trani shop & get a 2nd opinion..
Ask them what causes a overflow..

well it depends on where it is leaking from if it is leaking from the pan in the seal area replace the seal and you might as well change the trani fluid and filter just to be on the safe side. If you cant find where it is leaking get a can of Gunk engine cleaner and clean the trani off nice and good the look for fresh leaks after driving a bit. If it looks like its a cracked case then you might as well just drop it and replace it. But the first thing is to pin point where it is leaking from. It could also be leaking from the trani fluid cooling lines.