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You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck
#349 of 396 clunking noise when in 4x4 mode
Nov 20, 2011 (11:44 am)
Hi guys....I have a 2001 GMC sierra 1500 extended cab with only 40,000 miles on it. I'm the original owner, so I know it's never been mistreated. Never had occasions to use the 4 wheel drive mode (hi or lo) and always drove in 2 wheel drive. Last week I tried to use it and something is wrong. It shifts into and out of 2wd, 4wd hi, lo and auto fine. The problem is when I'm in either 4wd hi or 4wd lo and I turn the wheels a bit to the left or right to navigate a curve (even starting out from a standing still position), when it starts to move in the direction of the turn, the truck jerks badly in both forward and also in reverse. There is a loud clunking noise every time it jerks. If I'm going straight without turning the wheels...no problem. All 4 wheels pull and no clunk or jerk. The 2wd mode has no problem whatsoever. Any suggestions as to what may be causing it?????
Thanks in advance....Wayne
Nov 26, 2011 (1:49 pm)
If you read your owner's manual, I think you will find that the truck should be driven in 4 wheel high at least once a month. I usually run mine about a mile in 4wd to keep things lubed. Also, all four wheels & tires should be close to identical or your driveline will windup and pretty much make the steering wheel impossible to turn in 4wd. If you ever plan on using the 4wd, you need to get it checked out by a pro. Hope this helps.
#351 of 396 Re: More "Service 4-wheel drive" error message... ugg!! [lugnutt79]
Nov 26, 2011 (10:16 pm)
Your transfer case is low on fluid. Guaranteed. I own three of these trucks. Good luck!
#352 of 396 Re: 4x4 mode problems [stoneybroke]
Nov 27, 2011 (2:34 am)
Thanks, stoneybroke!! Like a dummy, I never completely read my owners manual and didn't know about driving in 4wd hi once a month. Also, all 4 wheels and tires on my truck are identical.
I put a call in to GM...they said a dealer had to check it out, so I took it to my GM authorized service department. They checked it out and said there was nothing wrong with it.... that all 4wd's "hop" and clunk when turning on dry pavement and that it's just the way they are built. I find it hard to believe that it's normal for it to do that since it sounds as if something would tear apart in short order if you had to use the 4wd on pavement. But.....they are the experts....not me, so I guess I have to believe them. Thanks again for the advice.
Nov 27, 2011 (7:25 am)
Back to the owner's manual: I NEVER use 4wd on dry pavement. On corners, the ouside wheels will turn at different speed from the inside wheels-thus winding up the driveline. The hop and difficult steering is caused by things trying to equalize. If you have access to a dirt or gravel road, run it once a month to lube things. If you have to run on pavement, find a straight stretch of about a mile. Do you have the push buttons with "auto 4wd" as a choice? If you do, the truck will only use 4wd when a wheel slips.
#354 of 396 Re: 4x4 mode problems [mountjeez]
Nov 27, 2011 (12:18 pm)
I can't believe you didn't know enough not to run a four wheel drive vehicle in 4 high or 4 low on dry pavement ...unless you have an Obama sticker on your bumper.
#355 of 396 Re: 4x4 mode problems [mountjeez]
Dec 08, 2011 (9:17 pm)
Yeah it is completely normal for it too hop on dry pavement. Because if your turning the wheel your front tires arent going the same speed as your back tires so it jumps
#356 of 396 Re: 4x4 mode problems [mountjeez]
Jan 14, 2012 (2:28 pm)
You should avoid turning on dry pavement while in 4wd. This can be extremely bad for the ring and pinion gears in the difs. The problem is that when you go into 4wd it locks the axles so that they are all always turning at the same speed. This sound like it would always be the case but it is not. When you are turning (especially if it is a tight turn) the outside wheels are travelling a greater distance the the inside wheels and thus need to turn at a faster speed. If the axles are locked then this can not happen and causes the hop you are experiencing because one wheel is hopping to either speed up or slow down to match the other. Other than engaging 4wd on a long straight away occasionally for lubrication purposes you should only engage 4wd when you need it, which the vast majority of 4wd owners never really need to do.
#357 of 396 Re: 4x4 mode problems [garysrq]
Jan 15, 2012 (1:39 am)
Well put, Gary. Thanks for the great information. I guess I was expecting the smoothness of an "all-wheel" drive vehicle. It's good to know I'm not having to look at a ton of money for repair bills.
#358 of 396 97 silverado 4x4 not engaging
Jan 17, 2012 (1:39 pm)
i push the buttom and it just flashes but dont engage.