4H grinds, vacuumn or transfer case? - JeepForum.com
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post #1 of 3 Old 09-14-2011, 06:53 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Jun 2011
Location: somerset
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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post #2 of 3 Old 09-14-2011, 08:07 PM
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1995 YJ Wrangler 
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Location: Livingston
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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post #3 of 3 Old 09-14-2011, 09:24 PM
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1995 YJ Wrangler 
Join Date: Jul 2010
Location: Cincinnati
Posts: 635
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.

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