2000 Sierra Z71 - 4wd issue?

[john2115]

So this morning I was driving to work and after about 10 miles I started to hear a grinding noise, as I drove a little more it got louder. I have had a wheel bearing go out before so that's what it reminded me of, I turned the truck around to drop it off at the house and grab our other vehicle. When I went to slow down it felt like the brakes were grabbing really hard and making a groaning noise sounded like when they are wore down and need to be replaced. Just replaced pads and rotors about 2k miles ago. I was continuing my way home and had to make a right hand turn to pull on my street when the truck basically came to a stop and wouldn't move almost as if it was in 4wd, indicator light showed 2wd so I cycled through to see if it would disengage. I just wanted to get it to the house so as I was turning I was giving it some gas and it wouldn't move, finally moved at around 2500 rpm's and made a loud pop like something released from binding. I stopped after the sound and straightened the truck up tried to continue moving same thing but this time I was driving straight got it up to 2500 rpm's and it popped again and started moving.

 

Determined grinding noise was coming from the rear and truck felt like maybe the locker was binding? if that's so why did it feel like it was in 4wd? Noise was present all the way up to 50 mph after that it went away and front end felt very sloppy (wheel bearing?) But the noise was coming from the rear. I was already having issues with the transfer case but only in 4wd, could the transfer case have basically blew up and stuck in 4wd?

[Doug_Scott]

You may want to take a look at the front cv joints. You may have a seized joint. Should be an easy check.

[00Silverado4x4]

I'd definitely would get your truck to a shop to have it looked at thoroughly. It sounds like you may indeed have multiple issues. I agree it sounds like both the locker is bound up and the transfer case is stuck in the wrong mode.

[john2115]

Im waiting on the last few parts to rebuild the transfer case, I helped a buddy do his so its not too hard. I don't plan on touching the rear diff just wanted to see what everyones opinion on what it might be.

 

Thanks 06SierraZ71 I thought that might be it too.