Interesting question. As there were D2s with cdls then I would think that TC would work with them, after all, TC works through the ABS sensors on the hubs, nothing to do directly with the transfer box so I don't think it could sense that the cdl was locked. I think I am right in saying that the TC works by applying braking to a wheel that is turning more than it should in relation to the others, so if I had to put money on it, i'd say you would be OK. Others will get on here and correct me if I am wrong. Just thinking about it from basic principles.