My trans fluid is mixing with my radiator fluid, what can i do.

toyota engine ...typicaly hilux Efi

inlet manifold gasket blown
corroded water jackets on the inlet side

if found to be sound
wont be long before the oil will mix with the sump
try re torque the head bolts as a stop gap
head warped or blown across water jackets of the block
and not the oil jackets yet

Check your coolant for any trans fluid mixing,& ck the trans fluid for coolant, the radiator may have an internal leak (trans/ coolant), If they are mixing within the rad, radiator needs replacement. If OK then there may be 2 separate problems. The cooling system may need service or the rad is rusted and there is a separate trans problem. Ck for fluid mixture first!

check trans fluid if its automatic trans could use radiator for cooling

It does not have any fluid to work with. You also burned out many of the internal transmission components if you drove it until it was dry. If the fluid just poured out onto the driveway, then keep the vehicle off. Remove the radiator and fix or replace it. Refill the trans with proper type of fluid.

If the trans and radiator fluids mixed, which can happen if the radiator tanks leak between chambers, then your trans is corroded inside. The radiator can be tested if you can not tell by looking at the Antifreeze. The bottom radiator tank is suppose to be separate and as long as it leaked on the ground, the 2 fluids did not mix.

Your biggest problem now is to determine whether the trans is any good without spending money to fix the radiator. If you take out the Radiator, some places will test it free. Ask them about whether the 2 fluids mixed.
It will be key to knowing the worst case condition.

Your trans fluid oils all the bearings and bushings and pumps inside the trans. If the engine is not turning, the trans will not burn out its parts. If the engine is idling, the trans will burn out without fluid.

I attempt to give the cheapest Solution to your problems. You can only test the Radiator separately by removing the radiator or having the vehicle towed in. There is no way of knowing if the trans was damaged until fluid is restored to the trans. If the 2 fluids mixed, it is a bad thing. If the 2 fluids were not mixed, then it is better for the trans, but bad things happened to the trans without having fluid in it. Sorry I can not give you better news.

Are you sure it's is ****** fluid and not oil? Just asking because that sound odd. If it is oil it would be a head gasket. In that case the bottom of the radiator cap will look like choclate milk. If you're sure it is trans fluid it would be cheaper to put a aftermarket transmission cooler on it and plug the radiator off where the lines hook in.

some cars crack heads like saturn s series the satun v-6 blows out oil coolers as well as saab v-6 some cars have the intake gaskets leak if it has a oil cooler in the raid it could fail as well don't know what your working on if the oil looks pink check the trans fluid the trans coolers fail as well

that means trans fluid or engine oil is getting into cooant system. Not good. Either a leaky trans cooler in the radiator or a blown head gasket. Hope it's the trans cooler

if it is an automatic the auto fluid tank in the bottom tank of the radiator may have split letting the trans oil mix with the radiator coolant. Check that first

could becoming from ur oil cooler lines that go into rad,,,could have internal crack in rad,,,pull dip stick out & ck to see if motor oil is low or a grayish color,,if ok ck trans fluid to see if is low,,have to find out what kind of oil residua is in the over flow jug

most likely trans fluid is mixing with the coolant,most cars share the radiator with coolant and the lower part as a trans cooler but sometimes the spot that keeps the fluids seperated leaks and they mix,,,bad bad bad,can ruin your trans if you get coolant in it,dont drive it,tow it and replace the radiator and flush the cooling system and trans