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how the 4x4 vacuum system works on a 98 Dodge Ram 1500. how the 4x4 vacuum system works on a 98 Dodge Ram 1500. SOURCE: 1995 dodge ram 1500 4wd, vacuum line you sure its not the breather tube for the t-case. about 3/8 hose if it is. the vacuum lines for the 4x4 are small plastic lines. red, blue, yellow, etc. think there are four of them Posted on Jan 10, 2009. Buy Now!New 4WD Vacuum Switch from 1AAuto.com http://1aau.to/ia/1AFWA000051A Auto shows you how to repair, install, fix, change or replace a damaged, worn ou.