plugged vacuum modulator T-400
Im curious as to why the th400 I bought has a plug in the vacuum modulator hole. Also a metal plate bolted over the location. Is this something a shop does to protect for storage or is this a bypass mod? I was on my way to buy a modulator but im also struggling with different options.. I need whatever is best for helping a buick 3.8l v6 operate this trans..
appreciate any thoughts and time, Mike.