i have read and searched about 4wd. it is saying that the vacuum lines go to the t-case. i will guess that the 3 of them are on the top of the t-case. so my 4wd does not work i need to chek my lines so could some one show a pic of the t-case in the car. and of where to un bolt it? thanks

 

Maybe this will help.
https://blazerforum.com/m_52228/tm.htm