Stuck in 4 High
#11
12-18-2014 | 02:52 PM
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Joined: Oct 2013
Posts: 111
The encoder motor switches the transfer case. And I think with the 3 button style, the transfer case switches vacuum to the actuator under the battery to lock the front diff. Additionally, the vacuum switches only after the transfer case has switched to 4HI from 2HI; no change in vacuum between 4HI and 4LO.
So if the transfer case is switching okay, and the new vacuum switch installed unlocks the front diff, then I am thinking it is the vacuum switch on the transfer case that is stuck/failed....which is a bit of a "bear" to get to, but possible. I assume that there is no fluid in the vacuum lines coming out of the transfer case; is this correct?
So if the transfer case is switching okay, and the new vacuum switch installed unlocks the front diff, then I am thinking it is the vacuum switch on the transfer case that is stuck/failed....which is a bit of a "bear" to get to, but possible. I assume that there is no fluid in the vacuum lines coming out of the transfer case; is this correct?
#12
12-19-2014 | 06:36 AM
Super Member
Joined: Oct 2008
Posts: 1,760
From: Tucson, Arizona
Of course there should be zero fluid in the vacuum lines, so even a very little means trouble. There are several threads on here about the transfer case vacuum switch, just do a search and you will find alot of info.
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