4x4 problem!! front wheels lock up..

[Edgar Estrada]

hi I have a 2000 chevy Silverado 2500 extended cab and I have a problem with 4x4.. it works fine on 2 wheel drive no noise or anything but when I engage 4wd my front wheel lock up and my back tires spin like a burnout but the front ones wont turn at all any ideas if it would be the transfer case or the front differential? and how can I test to see which one it is.....

[Sierra Boy]

Sounds like something in the transfer case...they can be rebuilt and or buy them rebuilt to save $$$$$. Check on the chain in the transfer case to see if that is bad as well.

 

Sierra Boy