4x4 Help

[hlmoose]

Alright im not an idiot but i am pretty new the the 4x4s. but i have a 02 silverado 1500. i have a bad knocking coming from somewhere underneath the drivers side. Nothings scrubbing, not the drivers side cv axle, or the universal joints in the front drive shaft ( I swaped them out). A buddy of mine looked under when i moved the truck n he said it sounded like it was from the transfer case. also the frt drive shaft like jumped when it made the sound. it only does it in 4 wheel drive n mainly turning. so any ideas would help. ?????

[RaddHazzard]

I had a bad knocking under my truck after a good day of off roading. It sounded like someone had a hammer and was beating on my floor boards. Turns out it was my front passenger hub or something. It wasnt the bearing which later went. I think it was under 200 to fix at the dealer. Dont know if that helps.

[mtiffinal]

I once had a very similar sound on my past truck. Ended up being the auto locking front hub.

[asilverblazer]

If it only does it while turning it might just be binding up. Try it on a really loose surface, deep sand, snow, ice, really slick mud, etc. if this lessens it it might be normal. Knocking isn't how I would describe the noise this would would make though.