ok i have a b16a in my 91 si...teh serial number on the tranny starts A1..ive never heard of an A1 tranny, if thats what it is...only Y1 S1 or YS1. the tranny also crunches when trying to quick shift, especially at high rpms. should i replace the tranny with another one? and which one would be the best? S1? any help is appreciated

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