Yesterday found out the hard way I don't have 4wd. Today checked front axle vacuum motor and found it engages. With all four wheels off the ground I engaged 4L and put transmission in gear. While the rear wheels spun the front wheels do not spin. I notice the front drive shaft was slowly rotating, but I cound easily stop it with by hand. Same results for 4H. I adjusted the linkage just to be sure.
I have the np231 J xfer case. Is the xfer case bad? Is there a possible simple fix or do I replace it with a rebuilt? Is there a suggested upgrade? I just mess around on the back roads in Big Bear area.