We do have limited slip diffs in BJ4's. The ATD diff does just that.
There was a guy on here who had rigged his D4 or BJ4WE with a diff in the middle and it was rubbish because he had no way of hardening the action. I'm not actually sure an adjustable middle diff would actually be much of an advantage in a 1/10 over a slipper clutch...
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