Why do i got trans fluid in my radiator it over heats and oily water comes out

The transmission cooler is usually located inside of the radiator. I would take it to a radiator shop to have it tested as loosing trans fluid and mixing antifreeze into the trans fluid will ruin that expensive transmission very quickly.

Flush coolant system again. Do you have a brown sludge in the oil. Do this get Preston coolant flush, drain radiator drain coolant tank, fill radiator with water, add the Preston run vehicle for about 15 min remove lower radiator hose from radiator. This will allow all residue to be removed from engine. Replace radiator hose. Fill radiator with appropriate amount of coolant. Disconnect tank from system and let water run through tank until it is clear. Reconnect tank and you should be good. Unless you have oil and coolant mixed which means a blown head gasket or cracked block

Water mixed into trans fluid or oil will cause a milky appearance. Either there is a bad seal on the trans and you drove thru flood waters or the heat transfer pipe for the trans that is inside of the radiator has failed. Don't drive!!! Have it towed to a trans shop and have them check it out or you may be replacing the entire trans.

Engine oil or transmission fluid? Many radiators have a transmission cooler built inside them. Trans fluid can also produce an oily sheen on top of the coolant

Well, the trans is on the left or drivers side of the van.
If the trans were leaking fluid it would be red.
Orange could be radiator coolant. It could be a hose or the water pump.
Someone will have to narrow down where it is coming from.

Very likely that the oil you have found in the radiator is transmission fluid. There is a built in transmission cooler that is inside one of the radiator tanks. If the cooler fails, trans fluid will get into the coolant and when shut off, coolant can migrate into the transmission. You need to replace the radiator and then drain and replace the trans fluid. You cannot drain all the fluid (pan removal only gets rid of about half) so it's best to do that once using a low priced but proper grade of fluid, run it for about an hour, then drain again and re-fill with a better quality fluid. (also not a bad idea to use some lucas trans conditioner in there).
Hopefully, you haven't damaged the transmission, otherwise you may be looking at a rebuild.

You have oil leaking into the antifreeze and if this is happening you also have antifreeze leaking into engine oil could be head gasket or intake manifold gasket or cracked engine block Has the engine over heated resently at any rate antifreeze in the oil is vary bad and will distroy the engines oil ability to lubericate the engine parts

Sounds like you have transmission fluid in the antifreeze. The transmission cooler might be leaking in the radiator. If it is, replace the radiator.

Transmission fluid will be red in color. Radiator antifreeze will be a different color either lime or orange. Antifreeze has a slimy consistency while trans fluid is simply oily. Put a piece of cardboard under the engine to see if you can pinpoint exactly where it is coming from. Could it be condensation from the a/c? If so, that will be clear water.

Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
IF the trans is overheating the engine CAN overheat

They share the same cooling source and trans fluid gets hotter than oil, but yet it has a wimpy cooler built into radiator. Maybe add trans oil cooler to system.

Also outside temp affects the cool down rate of the radiator, ie...hot air trying to cool down hot radiator/engine is less effecting than cool air cooling hot radiator/engine