Cooler transmission thermostat?

[David Klopper]

I’ve heard of our vehicles being fitted with a 170F cooler engine thermostat but does anyone know if the same kind of cooler bypass valve exists for our transmissions? (See part 8 in the attached diagram)

I’m wondering if that might be a way to keep transmission temps cool.

Also does anyone know at what temperature the bypass valve opens?

Thanks

 

[BradM]

Once the trans is up to temp, I would expect the thermostat to not be used again until the next cold start. Best way to cool it is add the extra cooler (PP, PI).