How to size Transmission cooler

Does anyone have a formula for getting the correct size oil cooler for a turbo 350 ******. My Radiator does not have connections for the transmission and I want to get a cooler that will allow the ****** to
stand up to long hual driving. Any input will be appreciated. Thanks in advance. Gary

 

Bigger is better. I recently went to the heat-sink style cooler; it seems to work ok, but I don't have enough miles on the car to make a definitive ***essment.

 

I like to use factory Ford OEM coolers.



This one is sized for 7.3 litre Ford in a 99 to 02 Ford Super Duty ... I find them on eBay for a fraction of what Ford dealerships want and the ones I get are brand new ... and easy to adapt.

 

I got mine from a Ford turbo diesel, from the wrecking yard, for ten dollars. They are everywhere. I mounted it under my cab instead of in front of the radiator.

 

This one is big. Cools down a trans w/ a 4,000 stall converter in the 55. On at 180, off at 160.
Stack plate cooler & 10" fan.

 

Thanks guys I hurt the ****** running just the heatsink type like run by Animalain
it was ok when driving local but on trip to Godguys in Dallas 6 hour trip one way on the way back ****** over heated bad still works but will need to be pulled and redone again only had about 1000 miles om it. Will look for one of the types suggested I like the idea of a fan . I will also be adding a temp guage to monitor whats going on this time. Gary

 

It also depends on what stall converter you have and what gearing you have and what size engine you have. If you have a higher than stock stall speed, you need a bigger cooler. If you're constantly cruising at an RPM that's below the stall speed of your converter, then you need a huge cooler. If you can cruise at an RPM that's higher than the stall speed, it won't run so hot.

I think a lot of people take the transmission heat for granted because they don't have a gauge to see how hot it's actually getting. I have one car with a big block Chevy and a TH400 and a 3000 rpm stall converter with a B&M stacked aluminum cooler with a little motorcycle fan blowing on it through a home-made shroud. I put a tee in the transmission line and installed a sender for a temp gauge. It's kind of scary watching the temp start shooting up fast whenever you're not moving fast enough. Cruising at 70 mph it's great and maybe only 140 degrees. But if I cruise at 45 mph in high gear on a mountain road, the temp just keeps climbing. When it gets up to 195 or so, I get scared and put it in 2nd gear for a while until it cools down.

Since you're probably not going to install a temp gauge, I'd say play it safe and put a huge cooler in there -- whatever you can fit. Heat is what wrecks transmissions.

 

Exactly, put the biggest one in you can fit, you can't possibly overcool the transmission.

 

Would a cooler like this be enough to cool a turbo 350 on its own? My original radiator has no provisions for trans cooler. What about stop & go driving? Thanks...