We bought a used transfer case from a 2000 suburban. We was told it would work. After installed it wouldn't run. We put it in every gear and nothing except when I passed reverse to put in park, it made a terrible noise. We uninstalled the transfer case. We found the only difference is the encoder motor so he fixed that or we thought that was the issue but maybe this transfer case is no good as well. Could it be the pump that's bad in this one or the encoder motors being different just not work period and you have to buy a new encoder motor??? I don't know, I'm just learning all of this myself. Hopefully what I've posted makes sense. Thank you for replying!