I read occasionally every now & then that it would be wise,as it increases tranny life,aids in performance,etc. If so,how do I determine what size is best,& still fit in the desired location.I guess its a bit tight on C3's,eh? Thanks for any info... Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|
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! There is some debate on routing the flow through the cooler; through the rad. and then the cooler; through just the cooler by itself; through the cooler and then the rad. 
My personal recommendation is to run the largest cooler you can get in, and use it by itself, without running through the rad. This method has worked perfectly for thousands of units that I do every year, for many years, and I've never had a heat or cooler flow related failure in any of my units. Just my opinion!
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|
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I think you might have a hard time getting one that is 75 inches thick into the car!! 
Obviously a typo there! Those prices seem a little high to me, but I get them way cheaper anyway, through my shop. The "Hayden" brand is OK, but they are not as sturdy as the "Long" brand, nor are they as good looking when installed. Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|
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The additional cooler should be installed AFTER the factory cooler.
From the trans to the bottom of the OEM cooler, then out of the top to the bottom of the aftermarket cooler, out the top, and back to the trans.
They must feed from the bottom to purge all of the air out of the cooler. Fed from the top leave air inside the cooler. The air causes the cooler to become inefficient. If you connect the aftermarket first, you may actually heat the fluid back up a bit when it hits a cooler surrounded by hot antifreeze in the radiator. A bit counterproductive.
(some day, no strike that, October 2008 it turned red, still in progress!)
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coming into the bottom of the tube/fin style cooler and existing at the top is correct, but if the cooler is the newer style plate system cooler it depends on how its mounted. They should never be mounted with the fittings facing down; the air will get trapped in the top of them. On the side fittings facing right/left or fittings facing up is the correct way to install these.
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