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Will be a JB1 of some derivitive I imagine. But you need to get the full code to get a replacement gearbox as JB1 is the model of the gearbox to get the right one with the correct ratios you need the full code which will be JB1-XXX.
My mate had this with his S13 after it got the mother of all cainings when we went to japfest, was pissing out blue smoke. Didn't do it on the way home and hasn't done it since, there was a reason behind it apparently but I can't remember what it was.