Thread: Can I run w/o trans oil going into radiator???

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J. Robinson, the only comment I would add to your experience is that I belive a 700R4 or other OD trans will build up heat much quicker than a TH350. Different thoughts on cooling may apply.

Denny, Good reading. Thanks. However, I would add this based on their discussion and my experience.

On my '34 w/ 700R4, I don't use a radiator cooler, and I have a 180* thermostat. With my aux. cooler setup, the temperature in my trans pan rarely, if ever, even moves the needle off the 150* mark. So, it seems that if I did run through the radiator, I might actually be warming the fluid.

Or, maybe the water temp in the bottom of the radiator would be less than 150, and I'm over-thinking it.

Originally Posted by Henry Rifle

J. Robinson, the only comment I would add to your experience is that I belive a 700R4 or other OD trans will build up heat much quicker than a TH350. Different thoughts on cooling may apply.

I never considered that and it's a good point. Don't 700R4's have a lockup converter? It would be interesting to know (1) does an overdrive trans run cooler or hotter than a non-overdrive [or is there no big difference] and (2) does the lockup converter make it run cooler because it's not "squeezing" the fluid?