Radiator options with trani cooler bypass
 

Is there a radiator out there were there is no chance of mixing between the radiator and transmission lines? I know the strawberry milkshake is a common problem and I'm wondering other than bypassing with an external cooler (which slows the warming of the trani fluid) is there an aftermarket radiator where line failure/mixing isn't possible?

Thanks!

You might be able to get a custom made one where the Transmission cooler is completely separate of the Radiator

At that point you may as Well Go With a Stand alone cooler

Only when the different fluids are completely separate can you be assured of no mixing in the event of a failure

If you replace your rad with a good quality one I doubt you'd ever have to worry about it failing if you changed the antifreeze once and a while.
There's millions of vehicles with the same setup.

I just bought any old decent quality Rad at 200,000km, and plan on doing it again in another 200,000km. its only common on 15 year old 4R's with original rads and 300,000km on them and used in winter conditions where salt use used. If your in warm climate area's just bypass it and never look back, cold climate will need the warming of the tranny fluid.