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The 545rfe is not based on the old torqueflite architecture at all, other than the fact that they're both aluminum cased rear drive transmissions that use a torque converter and planetary gears (like every other rear drive transmission out there, including those of other manufacturers). The 48re in the diesel trucks was the last iteration of the torqueflite architecture. The 545rfe, which evolved from the 45rfe, is a totally different transmission architecture.
 
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