4H grinds, vacuumn or transfer case? - JeepForum.com
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Unread 09-14-2011, 05:53 PM   #1
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1990 YJ Wrangler 
Join Date: Jun 2011
Location: somerset, ma
Posts: 3
4H grinds, vacuumn or transfer case?

Hi guys, new jeep owner here in need of 4wd information. I have a '90 YJ 4-cyl manual shift with no mods. 4H grinds when I try to engage it but goes into 4L fine. 4L seems to work but the 4x4 light does not come on. Should I look towards the vacuumn lines/system or the transfer case? Thanks in advance of all responses.

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Unread 09-14-2011, 07:07 PM   #2
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1995 YJ Wrangler 
Join Date: Dec 2005
Location: Livingston, Louisiana
Posts: 1,134
Grinding when going to 4 hi sounds like transfer case issues. Front axle not engaging/light not working sounds like vaccum or issues. It may be the CAD.
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Unread 09-14-2011, 08:24 PM   #3
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1995 YJ Wrangler 
Join Date: Jul 2010
Location: Cincinnati, Ohio
Posts: 634
4x4 light not working is most likely from the vacuum lines. I'm guessing the tcase might be bad too, since it works in 4lo but not 4hi.
Free Chuck!
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