i did a search with no luck. On the th 350 there are two cooling lines that run to the radiator. one went into bottom of radiator and the other went into my auxiliary tranny cooler. What is the correct set up btwn the top line coming out of tranny and the bottom line. They are both the same size and I dont know how to plumb it. Thanks

This is the stock radiator in my 67 that originally had the powerglide.

Bottom line from the trans is the outlet, and it goes to the top of the radiator. Put any aux cooler in the line coming from the bottom of the radiator to the top of the trans. They need to go in line after the radiator cooler. smile.gif

Thanks alot. I had to think about the response for a while. Put the bottom line (outlet) into the aux cooler and the return line from bottom of radiator into the top of the tranny. Is this correct? Is the top tranny line the outlet meaning hot oil and the bottom line is inlet meaning cool oil. graemlins/clonk.gif

The bottom line coming out of the trans is hot fluid going to the top of the radiator. Then, the bottom line out of the radiator should go to your aux cooler, then out of the aux cooler on back to the top fitting on the trans.

Thanks again, that makes sense now. Sorry about the confusion. It makes more sense to me if I know which is hot or cold. smile.gif

While the routing of the cooling lines is correct for cars driven in warm climates, and while most of us don't drive our Chevelles in the cold, the cooling line information given above isn't 100% correct.

If you drive in cold weather you don't want to cool your tranny fluid after the radiator. You want to warm it in the radiator after it goes throught the aux cooler.

If you only drive in the summer, then go tranny -> radiator -> aux cooler -> tranny.

If you use the vehicle in the winter go tranny -> aux cooler -> radiator -> tranny.

I hate to say it, but that is the silliest thing I have heard in a while! smile.gif Trans fluid does not need to be warmed to work. Cold fluid will do no damage. Why would you take fluid and WANT to warm it to 200* at the radiator AFTER you run it through an aux cooler? Makes no sense! And, you still will have plenty-warm ATF in the cold winter months even after it has been through two coolers. The key to long trans fluid life is holding the temp down, but warming it has never been an issue. The only time warming ATF has any benefit is in a race application, where you want a constant temp if possible so the ET's will repeat run-to-run. The whole idea behind adding in a cooler after the radiator is to drop the temp down when it is at the 200* area and the radiator cooler cannot keep up. Whoever told you this was blowing smoke! ;)

I had the same question about routing but my inlets on the radiator is horizontal, both lines go into the bottom of the radiator, no upper and lower????

I have heard that it didn't matter which line went where. Anyway, if the bottom port of the tranny is the outlet then shouldn't it go to the lower radiator port so that no air is entrained?

Most coolers and radiators are not sensitive to flow direction, so it does not really matter. Air is not an issue, it would purge right on through.