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Old 03-21-2011, 01:41 PM
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Join Date: Mar 2011
Posts: 2
1st question

hello all,

I've been wheeling for years (mostly blazers and suburbans). I recently got my 1st Jeep. It's a '90 2.5L stock when I bought it, now with 4" suspension lift w/ 33's. No other mods at this time.

The 4wd will not disengage. 4h and 4l work fine, and the xfer case shifts into 2h without a problem. 2h rides ok at city speeds, however, the 4wd light does not go out, and it begins to vibrate at higher speeds. when the xfer case is shifted to 4h, the vibration goes away...

I have no idea how the damn vaccum system works. I bought a manual, but it's r/r not troubleshooting.

any advice is appreciated!


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Old 03-21-2011, 01:44 PM
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Join Date: Mar 2011
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ANNND.... apparently, I'm stupid, because while I've done quite a bit of reading on here, I'd totally missed the big STICKY about this very problem...


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Old 03-21-2011, 01:53 PM   #3
Join Date: Mar 2011
Location: Derry PA
Posts: 455
sounds like a vacc leak, or a bad shift motor worst case is something stuck inside the axle.
1995 wrangler 4 cyl 5 1" poly body lift,2.5 ome 3/4" shackle, 32" swampers lock right in the d-30
1.25 motor mount lift full cage hi line fendered
98 TJ 2.5 5 speed 2.5 rc lift 1" poly body lift rancho 5000s
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Old 03-21-2011, 01:54 PM   #4
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2016 Jeep JKU Rubicon Rock Krawler 3.5" Fox shocks, RK Drag Link Flip, JKS quick disconnects, Atlas tire carrier, No light bars but Yukon 5.13 and E-Lockers!
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