73-87 Chevy _ GMC Trucks > Engine/Drivetrain

Transmission cooling lines in new aluminum radiator

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Mr Diesel:
Johnny,

Sounds like you need to figure out an answer based on your own research instead of relying on other's opinion. I will offer my own broad opinion, although it may not amount to much more than a fart.

It seems safe to assume that any reduction in volume could negatively affect your transmission cooling capability. However, there are a lot of factors to consider as to whether the change would be significant for YOU. If this is going in a 1/2 ton Truck driven back and forth to work, probably utterly insignificant. LOTS of these trucks and others like them are driven with NO cooler and survive just fine. If this is a 1 ton Truck driven daily with a 15k lb loaded trailer through the Rocky Mountains, maybe you want to keep the volume as high as possible. Capiche?

Shifty:
Johnny, sorry I didn't jump in on that.....honestly, the pressures involved are very low, and don't need large passages for higher flow rates....and, the manufacturer of the cooler may have it figured down to a science to keep the fluid in the cooler for a longer time for max benefit. 

Maybe check the flow with compressed air, and see if flows to your liking as well.  I heard a statement a long time ago that an external cooler doubles the life of an automatic transmission, so I think you'll be ahead of the game regardless. 

Cheers!

JohnnyPopper:
Thanks guys!

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