![]() ![]() The end results are internal and external leaks as the the seals lose their elasticity. At approximately 260 degrees F, internal transmission seals, which are often manufactured from a polyacrylate material, begin to harden.The result is the formation of varnish inside the transmission. At approximately 240 degrees F, important additives begin to cook in the automatic transmission fluid (ATF).The ideal operating temperature for automatic transmission fluid is somewhere between 175 and 225 degrees F. In any case, loads coupled with stop-and-go traffic increase the heat level in an automatic transmission. This is also true for trucks that haul heavy loads or tow trailers battling tough conditions such as long grades, high altitudes, or desert heat. Engine rpm is up across the board, and the automatic transmission builds heat. ![]() This is especially true in big-power, street-strip machines that combine lots of horsepower with a small torque converter and steep rear axle ratio. It’s no secret that heat kills automatic transmissions. ![]()
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