@ Chris- I agree about 180* being kinda scary...I am going to disassemble the thermal bypass once iths out of my tahoe and see if it can be modded in any way to lower the temp. at which it fully opens.

 

Agreed 100%, what cools a cherry hot peice of steel quicker? Plunging it into a water vat, or allowing it to air cool?

Always run the trans fluid through the rad.

peace
Hog

 

For anyone curious, as I was, if their 40k TruCool has the bypass or not, I found this chart:

 

What if the water vat was 200 degrees Fahrenheit

 

yep. bypass the rad.

 

My trans runs at 150 during the summer why would I run it through radiator through HOTTER water to "cool" it down? Also with built transmissions with higher line pressure, the chance of busting the end tank goes up exponentially and can take out your transmission. So why risk it for no benefit?

 

I need to get mine up to temp in the winter, if I bypassed the rad that would take for ever if at all. I must say though, my trans temps are consistent all year round, right about at 160* with a TruCool 40k and 258mm converter.