Correct. Modern non-lock-up converters, although very efficient, will generate more heat than the solid connection of a lock-up converter.
Heat is always the enemy of an automatic transmission, so be sure you have an adequate transmission cooler and use the highest quality transmission fluid available. In a serious performance car, change the fluid and filter regularly/annually too.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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