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no idea, you could've cracked the reverse drum, that's a common failure involving loss of reverse in automatics

i don't know why that would happen at highway speeds, but many things including the few clutch packs serve many functions and multiple gears

if you suddenly lost reverse for no reason with no noises or reasons, i'd agree about trying to mess with the valve body, but given the noises and other symptoms, it sounds like something internally has failed catastrophically
 
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