Heat is a Transmissions worst enemy as we all know.
My transmission so far runs at a steady 180 on normal summer days and nights and sometimes at 200 on really HOT Humid Days.
I will be trying a new looser converter later in the season, but I drive this thing on occasional week ends around the city and some times to the track. I don't want to introduce more heat to the trans with out having a few tricks on hand to meet the problem if it arises. What are your tricks.

Been driving/racing w/an 8" 5000+ vert for years and my temps have never been above 180 and that`s summer hot desert weather and usually averages bet 150-160............I do run a seperate B&M trans cooler catching air below my ft. lic. plate.

what he said. get the biggest cooler u can fit with a fan. 5000 verter, never over 200*.

Synthetic trans fluid can reduce temps and provide extra "insurance" against heat-related issues because it holds up better than conventional fluids if temps do get out of hand. I use Amsoil Supershift in my race car 904 , also with a cooler, converter actually flashes between 5,000 and 5,400, and my transmission rebuilder usually comments on how good everything looks inside when I do bring it it for preventive maintenance.

Amsoil Supershift

They also have a universal fluid which has been working well in my 2004 Dodge diesel.

Amsoil Universal trans fluid.

I used to drive with a 4500 converter and used a small B&M cooler,

after driving over an hour the cooler never even got hot.

My TA 8" stalls around 5900, no problems on the street keeping it cool. Dave

7200 stall 8in converter from Lenny, with ATI Super F syn fluid and a B & M Super Cooler, in a lightweight T-400....behind a 417ci R3/W8.

No issues with street driving, so far.

No joking, I have what is the biggest cooler I've seen. It's almost as big as my radiator of which is 29 inches across on an early B-Body.

Yeah, I'm trying Lenny for a unit.

I also use the supershift Amsoil fluid.
No issues for years, but I'm going for more stall and just wanted to be sure.
The one fan that I do have is a 1995-97 Caravan unit that keeps both the engine and trans cooler at bay in traffic. Usually when I'm on the open highway, the incoming air is good enough to keep it all cool.
I also have the trans cooler lines in Copper as that material gets rid of the heat faster. Years with no issues.

I forgot the actual percentage, but not much at all.
My cooler is a aluminum Hayden unit.

5200 stall on the brake 8" converter, B&M cooler as well, never gets anywhere near 200 on the streets.