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4H grinds, vacuumn or transfer case?

488 views 2 replies 3 participants last post by  jeepinvader 
#1 ·
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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