Need quick answer on 700R4

[krue]

My bro is plumbing the cooler to his 700R4 and needs to know which fitting on the tranny is supposed to be the line to the cooler and which is the return.

[Hart_Rod]

I don't think it matters which one you use.

[John Fabris]

I ran bottom port to bottom, top to top. I did this after looking at a buddie's 87 chevy truck with a 700r4...

[BobbyK]

From TCI's site.
Half way down the page.
Upper port is the RETURN
Lower is out or feed to cooler.
http://www.tciauto.com/tech_info/cooler_fittings.htm

[VetteVet]

Here is some info I c/p from a website on the internet and a pic I saved from another site.

Transmission Cooling: You must have a transmission cooler in your radiator regardless of what someone has told you for the transmission to last. Auxiliary coolers are just that, in addition to. Water cools better (faster) than air always, period. The transmission fluid comes directly from the torque converter at a much higher temperature than the water in your radiator and is cooled to the water temperature fast. Then it goes to the auxiliary cooler to be cooled far below the water temperature. If you don't need a cooler in your radiator why does GM spend all that money doing so? If you wanted to cool a red hot piece of steel fast would you stick it in water or air, see the point. Your transmission will run cooler with a lock-up converter. This is more important with stall speeds of 2000 RPM or higher.

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[krue]

Thanks, vettevet, he's doing the aux cooler then radiator cooler, so we were trying to figure out how to get the flow in that order.