Ok, recently I did a motor swap and put in a motor from a '98 Envoy I think it was. It is a 4.3 and everything, all the electronics hook up correctly. When I go to put it in four wheel drive the rear wheels lock in, so I know the transfer case and all that is working fine. I just don't know where I'm supposed to hook up the vacuum hose, I'm about 95% sure that is my problem. Any help is greatly appreciated!

 

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