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87 W-150's 4wd won't stay engaged

875 views 1 reply 2 participants last post by  13HemiRam 
#1 ·
So my 87 rams 4wd will engage sometimes after continuously messing with it or when going down the road with the lever in 4hi if you slightly or anything more than slightly accelerate the light comes on and I know that's when the 4by kicks in but as soon as you let off 4by is out Help please think it might be a vacuum problem if so what? I have no clue thanks
 
#2 ·
Check the vacuum lines on the actuator on the front axle. Mine were loose on my 96 Cummins I just used a small hose clamp or you could maybe even use a zip tie on the line to make sure the line is tight on the nipple so it won't leak
 
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