i have a 99 dodge ram 1500 and the 4wd is kicking out, originally i had a broken vacuum line which was y it was kicking out so i temporarily taped it till i had money to replace the lines,then the 4wd stopped all together so i changed the 4wd vacuum lines ans still nothing so i changed the 4wd vacuum actuator on the front diff and now i have 4wd but it slips, anyone have ne idea what this might be?

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