Air vs Water cooled Tranny cooler

I seen and drove trucks wih both. 07 Century with Detroit 60 and 10 speed Eaton had air cooled, 04 Volvo with ISX and 99 T2000 with 3406E both with 13 speed Eaton and both water/antifreeze colled. 07 Century i anly drove for a months so not much experience or problems. Tranny temp newer climb higher than 200f. On 04 Volvo that i drove for 10 years didnt have any problems but tranny temps were in 200-220s since ISX runs warmer with EGR. Tranny cooler was located in frame, right over tranny. Now on 99 T2000 same setup as Volvo. Tranny temp is 200F on hot day. On 99 T2000 i made all heather hoses with shut off valves and i did some testing. If i shut off tranny cooler antifreeze line, tranny will run 220F on hot day.
Now im thinkin to retro fit Air cooler and mount it somewhere where is a lot of air passing thru. Is this setup much efficient vs water cooled setup ?
With Air cooled setup will eliminate mixing tranny fluid and antifreeze due to tranny cooler
Also who makes good Air cooleer tranny cooler? Part #s would be great
Thanks

 

Was it Air or Water cooled ?

 

I have found Eaton part #s for Air cooled setuo? K-1956 for kit and optional filter base S-1404 and filter 17238

 

Here is finished retrofit air cooled tranny cooler. I coulnt foun better place so i mount it on pass side right in front of fuel tank. Now is time to test it

 

Did some testing. On idle over night temp was 145F vs 180F with. Driving on hot day 96F temp was 180F vs 205F. So there is good temp drop plus no more chances coolant mixing with tranny fluid