Hello everyone, Chavoco, compatriot, reading your post carefully, I think you have problems in the automatic range sensor, it informs the electronic control unit of the box the position of the lever, it is typical by dirt that they begin to delay in making the change, and then when, it passes from neutral to D, the computer does not recognize it, therefore for it it is as if it follows it. For the diagnosis of these boxes I use the ATSG manual, Nissan is in English, you can download it from Torrentz. If it were a mechanical problem, wear of bands or discs, usually when the AFT, skate, and seem to be the case. The other much less likely is that it finds problems in the manual valve, that you move with the lever, redirect oil to modulated press Hydraulic stuck, but you do not report abruptness when the changes pass, for detector problems it is necessary VG30E coupled to the 4 velocida automatic with electronic marches that are the ones I have seen. Similars from Quilpue, Chile and lucky luck.