Does it matter which side of radiator the transmission lines hook up to?

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You generally want to hook them to the transmission side of the radiator. The engine side works ok if you can get the hoses to fit but then your engine doesn't have anything to easily connect to.

Beyond that, it's in one end and out the other. Like Thai food. If you're running an auxiliary cooler you can run them in series or omit the radiator cooler as long as the aux cooler is big enough.
 
I use the old rule that heat rises. From transmission to top, to transmission on the bottom.
 
With an aux cooler..... I run the rad cooler first then the aux cooler in series. My theory is that the rad cooler will cool it to coolant temp, then the aux cooler will cool the trans fluid below that. If you run the aux cooler first, the trans cooler may in fact warm the fluid back up to coolant temp.

I may be overthinking this....
 
ATF is usually 195° normal operating temp. Same as coolant.
 
Straight to the radiator it makes no difference. But if you have an aux cooler then feed the pressure side to the top I would think but it may not matter even then.
 
Ima thinkin' if you run a 195 stat,then the top of the rad will be at that temp. By the time the coolant gets to the bottom it should be running about 30 degrees cooler so 165. Now the cooler in the rad is just a little single pass tank. So it too will be at 165ish. The oil coming from the trans better not be too much over 230.In a streeter,most of the time it will be a lot less, so an aux cooler is rarely required. Fortunately the trans is not as sensitive to oil temp as the engine is , but Kansas winters can be pretty cold,so, if you need to run a cooler, at least get one with a temperature regulated bypass, and I would then run it before the engine rad, so the rad can actually warm the oil up in the winter.
I have run 904s without a cooler at all, with no ill effects, both summer and winter, behind a lo-perf 318. That aluminum box has a lot of radiating surface.
 
d55dave said:
With an aux cooler..... I run the rad cooler first then the aux cooler in series. My theory is that the rad cooler will cool it to coolant temp, then the aux cooler will cool the trans fluid below that. If you run the aux cooler first, the trans cooler may in fact warm the fluid back up to coolant temp.

I may be overthinking this....
Click to expand...
this is the correct way, always has been .
 
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