I switched to 3.55 gears to be able to cruise at a little lower RPM, and so I would not hit the RPM limiter in 3rd at the strip. The gears worked out great, except for one area. Now on the highway when cruising in OD, the engine rpms are around 22-2400 rpms with a non lockup converter stall speed. This turns the converter into a heat pump. The 2 B&M coolers I had on it would not cool the transmission on the highway in 95f weather. On a recent drive it hit 230 degrees, and caused me to pull off at a gas station and hose the coolers down till it dropped below 180. I was only 15 miles away from home, so drove the last bit in 3rd gear to keep the transmission pump turning faster. I made it home fine, but decided it was time to solve the problem.
I needed a new front seal on the trans any way, so pulled it and checked the pump, and also pulled the pan to check for signs of damage. I could smell the oil, and tell it had got too hot, but no other signs of damage. I rerouted the cooler lines, added extra insulation to the lines near the headers, and installed this huge cooler and made this chin spoiler to direct more air to the cooler on the highway.
It was 92 F here today, so I took it for a 50 mile road test. It only got to 185 on a long hill that I kept it at 70 mph on. On normal roads, it stayed 170-175. The cooler and chin spoiler has solved my over heating transmission problem.