Hello, I have a 1981 245 with a BW 55 automatic, the transmission wore out after I had been driving the car for 10 years, clunking, whining, and lots of heat. I have replaced it now with a nice trans I got from a car being wrecked, it came with a stacked plate cooler. I live in Newzealand it gets up to around 94 degrees F in summer MAX and hardly ever drops below 37 degrees F, its cold more often than hot. I do alot of hill driving and mountain pass driving, I plumbed the stacked plate cooler in before the radiator heat exchanger, and I could feel a difference, its bringing the temp down, I am just wondering should I do it the other way around for max cooling? or will i mess up the fuel economy in cold weather witch is alot of the time.