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Discussion Starter #1
When I put the truck in 4 wheel hi, and turn a corner... I get a pulling clunking snapping noise in the front end. It is bad enough to where I can feel it at my feet. When going straight, it is fine. Any ideas as to what to look for here? Is this a U joint problem in the front axle? Can someone show me a link to the schematics of the front end and tell me what the heck to look for here please. My Wife will be needing to drive my truck this winter, and I need to make sure nothing is going to snap on here while commuting to her work.
THANKS ahead of time peeps.
It feels like it is coming from the drivers side front. I have checked for play in the axle, and there is none. I'm lost here, but not afraid to tackle the problem, if no special tools are required.
 

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mines doing it too but i have play in the front axles. has done it in both 2wd and 4wd more so in 4wd. any help please???
 

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are you guys running lifts
 

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found my problem..... snapped a cv axle anyone know of any aftermarket ones????
 

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You do realise that you should not be in 4 wheel drive when the roads are not slippery. There is no inter axle differential.
I have a 2007.5 and know a lot of people with the same vehicle, and never seen a front axle problem in the GM's I have done a lot of "U" joints and front drive axles in the Fords.
 

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hunter grab the CV axle and see if you have play in it.. more than just a few thousandths I could see the end of the shaft trying to come through the boot. if so it's the CV axle
 

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Discussion Starter #10
I changed the fluid in the transfer case... I ended up changeing my front wheel bearings, due to the one being bad, and a bad ABS sensor. NOW, I need a couple new tie rods. No big deal really... simple stuff. BUT I REALLY need to get this 4x4 clunking sound figured out. When it was wet/slippery and raining the other day. I was out testing it. When the drive train is under stress of power... it does it... when off the gas, it goes away. The noise gets louder and softer... it is not a constant noise. CV joint?? Is there a shop that will tell me what my problems are for a minimal cost??
Come on you 4x4 chevy guys... get in the game and help a poor guy out. As disabled as I am... when I DO do my truck repairs... I am bedbound for the entire next day. I need to get this solved before winter smacks me in the face.
 

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Back up from the dead, nearly 5 years ago - did you ever solve this as I have a very similar problem. In short, under power,(heavy power), big clunking/something clearly not right. The 4wd selector motor was new from last year and I can switch into 4wd low, so it is moving fine. I have replaced the front diff solenoid. Drained and replaced front diff and transfer case fluids. Seems like the clutches that let you engage 4wd hi at moderate speeds are slipping? Is that possible? I'll post a separate thread, but wanted to see if you figured it out. I have an 03 2500HD with the duramax. 4wd, lowered a little, so no lift.
-Bobby
 

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Yes... I would have to say I figured it out. Although it took a fed ex truck broadsiding me to find the problem. A new transfer case and new transmission solved the problem. Not to make light of the situation... but my 2005 finally runs like new again. The broadside was in the drivers rear door and gas cap area.... I was spun around.... and that was it.
I took it to my dealership, and said FIX IT ALL. I got it back with a list of things that were related to the drive train... that almost ANY could have been the issue. I asked my mechanics, and they all said... "transfer case." I was surprised my truck was not totaled, as the damage was over 10k.... but my truck now has only one issue. Rust on the rocker panels. Other than that... it's almost all new with 134k on the odometer. It never had any frame damage, only exterior panels needed replacing, a new door ... paint, and parts I said I never had an issue with before accident. I got a sweet settlement out of the deal and I just wanted it all fixed.

If I was a betting man.... it's your cv joints/transfer case/bearings.
 

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Discussion Starter #13
Oh... I NEVER go from 2 to 4 wheel drive while in drive. I always put it in neutral first. It's been over 1 year... not a problem. I drive maybe 10 miles a week too. I am permanently disabled.....

My truck will be up for sale soon.... as I just do not need it anymore.
 

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I changed the fluid in the transfer case... I ended up changeing my front wheel bearings, due to the one being bad, and a bad ABS sensor. NOW, I need a couple new tie rods. No big deal really... simple stuff. BUT I REALLY need to get this 4x4 clunking sound figured out. When it was wet/slippery and raining the other day. I was out testing it. When the drive train is under stress of power... it does it... when off the gas, it goes away. The noise gets louder and softer... it is not a constant noise. CV joint?? Is there a shop that will tell me what my problems are for a minimal cost??
Come on you 4x4 chevy guys... get in the game and help a poor guy out. As disabled as I am... when I DO do my truck repairs... I am bedbound for the entire next day. I need to get this solved before winter smacks me in the face.
Did anyone ever figure this out ? I have an 03 Burb doing the same thing almost to the Exact description. I just changed out the case on the transfer case from the hole they get from the oiler inside. Put new gear lube in it. No problems on the lift in 4 high or low. Turning the wheels left and right. Of course there is no load at this point. This was with the front drive shaft in and out to isolate the transfer case.

On the road it clunks in turns and not on the straight away. I am going to check the ride height on the torsion bars. They are maxed out now, but was never a problem before. The 4x4 also was not working then. Possible the ride height is too high and causing the CV to bind ?
 

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Yours sounds different than the OP and mine. For mine, it ended up being worn clutches in the transfer case. I had driven from Greensboro, NC to Rhode Island after Christmas break last year with it snowing most of the way. I was doing at least 30-40 mph most of the way with most of the trip at 60-80mph. I was in 4wd the entire time. That, it turns out, is a big NO-NO. The clutches always slip a little front to rear and aren't designed to be running full time at speeds above 40-45mph. I was at 60+ for about 10 of the 13 hours driving....
So in short, I wore the clutches that allow engagement of the transfer case at speeds other than 0 mph. Replacement transfer case solved my problem immediately. I had also changed the fluid, the front diff actuator and the transfer case motor had been previously replaced before the issue.
Hope that narrows some issues for you. In my case, it was clunking under power application more than very light throttle. Turning wasn't really an issue for me.
 

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I have a 1997 chevy suburban 4wd and while in 4wd it was making a loud clanging noise when accelerating in 4wd hi or 4wd lo. Anyways everything underneath was tight and no play. I couldn't figure it out. It has the dash 2wd 4wd hi and 4wd lo electric switch it wasn't flashing while in 4wd hi or low and you could hear an engagement sound when 4wd selected. I thought it maybe it was the front crown and pinion gear missing a tooth. I took it to the mechanic and it was the 4wd actuator! I guess it was gimped up and engaging and disengaging while in 4wd and making a horrible clanging noise. Anyways I replaced the actuator myself a few years ago (which was possibly the easiest repair ever) but the 4wd light was flashing and it wasn't engaging at that time. Anyways it cost me a fair bit more to have a mechanic diagnose and then replace the actuator but if it happens again I'll know what it is. Also I may be able to help someone else searching online for an answer. It's a fairly cheap fix to do yourself and super simple to do. About $60 from 1aauto! Hope this helps someone out.
 
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