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there has to be something behind this .... ive found info on the net to also support this and a transmisson shop confirmed the t5 i have is from a 86 1/2 5.3L
Ford did not make a 5.3 in 86 or any other modern day year they did make a 331 back in the early 70s or late 60s but its a truck engine and a industrial use.. Did you ever think your info is wrong..