I picked up a cheap B16 driven car and had standard JDM J1 box which had a serious crunch anything over 3k rpm 2nd to 3rd. Had to really baby it to get it into gear with no grinding. Swapped out the oil for some Honda MTF and since then have done a couple of hillclimbs and car gets revved out (not thrashed) with no issues at all. Can't believe it made such a difference.
Try that.
Did the same with my turbo (Y1 box) which has a slight crunch, same gear over 7k rpm and made no difference at all. Worth a shot for how much it costs though.
Have a new custom set up with Type R internals etc in a cable box ready to install from Chez00 (Neat Gearboxes), can vouch for his work if the oil swap doesn't fix it.
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