What to do to inspect a used transfer case NP 247 Jeep Grand Cherokee before installing?

zeff2zeff2 Member Posts: 1
edited June 2015 in Jeep
I bought a used transfer case from a junk yard.Looks good and good price.But I am in doubt cause I tried to turn main shaft with the 4 All time engaged and noticed that if I hold securely the front yolk to stop it from turning along with the the main drive shaft,the main shaft still turns!This does not happen when in 4low.In 4low everything is well engaged and turning at same time!I am not sure about this!I would like to know if there is something wrong before installation!Your answer will be very well appreciated.
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