vibration

[chuck16]

Originally Posted by GMMerlin

This could be a launch shutter and by changing driveline angles it could be eliminated.
The pinion nose rises as the truck is excellerated this causes the driveline angles to change, by lowering the pinion nose 1/2 degree, you could eliminate the concern.

Hey Merlin,
Good to see you online again. How would one adjust the pinion nose then? I am assuming that is the one out of the transmission or is it the input on the Rear end?
I just had 2 different transmission shops do the balancing and U-joints.
Great to have you on this board, sir.

Evan

[Rammer500]

Originally Posted by chuck16

Hey Merlin,
Good to see you online again. How would one adjust the pinion nose then? I am assuming that is the one out of the transmission or is it the input on the Rear end?
I just had 2 different transmission shops do the balancing and U-joints.
Great to have you on this board, sir.

Evan

To change the pinion angle, you install tapered shims between the axle housing and the springs.

[ColoradoSilverado]

Well, I finaly fixed my truck, all vibration is gone. I did the u-joint check thing first like put it in neutral and try to move the drive shaft, all seemed very thight so I figured they were fine. Now yesterday I had to look again because the vibration was getting so bad. Too my surprise I saw the bearings in the front u-joint were falling apart, see picture. Got myself a new u-joint kit and voila done ! Man does this truck drive nice again. My advice, if it looks and feels thight, don't asume it's right.

Bert

[EA6BMECH]

Old thread, but my vibration I have is in the steering wheel. It's not the wheel though, I can just feel it there. To me it isn't something in the front shafts or case. More noticeable around 53 but I start to feel it around 30 to 60, then it disapears. Now I have a '91 Nissan truck and the vibration I feel in it I'm sure are the U joints. In my '05 Z71, I think it's just in the front end. Sort of a rhythmic vibration. It's not the rotors, I doubt the CV joints. I think it's the shafts. I hear they spin all the time and I think they are the problem. The Chevy dealer said they can't feel it. Well no sheet!! Why would they on a semi ruff road where they tested it. Plus they are Chevy people. I guess ya gotta own a few Japanese cars/trucks to appreciate a good ride. Anyhoo, anymore answers or suggestions?

[edj0527]

My Wifes truck, 2000 Silverado 1500, has a simular issue. Changed Tires and had the Brakes servised (turnes and new Pads). Now the Truck has a noticable Bouncy between 40 and 45 and you can see the Riughness of the Ride at high way speeds. Before the new tires and Brake Job Truck rode like a car very smooth.

Now we have been back several times for balancing and what not. on the second trio back a wheel was noticed as bent so I put AR-23's on it all the way around. WIder Rim but same tires (Bridgeston Dueler H/L's). Now that the new RIms are on I took it back had it balanced and that lasted about a week, Now the Bounce/Vibration is back and it gets worse the faster you go. Had the Tires CHecked again and Balnce was gfine and now bent rims. The WIfe now hates to driver her truck but hates my Tacoma worse.

Too many things changed at one time to being the process of elimination. THought maybe the tires but they have been checked on the machine and balance and tires seem to be round with no probnlems but get this bad boy on the road and its like a ball. ANy Suggestions?

Thanks,
Ed

[EA6BMECH]

Well I posted in my thread about my vibration. Found out it was a bent drive shaft. Guess that go over looked since it is only 2 years old. They said I must have bottomed out the truck since they saw a mark on the drive shaft and cross member. Yip, I jacked it up and looked at it, it was slightly bent and the good part is........I get to fix it on my coin!! Can't believe I may have done that, but the possibility is there. I tote my 2 sport bikes to tracks and something in my head tells me I hit a deep dip at a very slow speed and the truck dipped hard. But I guess when you have a "Chevy Tough" truck, you wouldn't have that happen.

As for your tires, it can be the tires. I had problems with Wal Mart and Douglas tires on my Camry's. 1st time I used them they were ok. Every set after that made the cars (I have 2) shake the whole time. Wal Mart said my rims were bent. I told them they weren't bent when I got here....... A year later I went back to the Michs and told the guy I wanna see this bent rim again. He spun it on the balancer and it was perfect!!!! I said "what happen to my bent rims???" He didn't say a word!! SO for a year or so I had to ride on a shaking car!! Man I was pissed!! Goodyear Eagles did the same thing.

Bottom line, tires can be screwed up, and many of them are. You can put on another set and your truck will still shake. Try another brand......really!!

[Bob B]

[ Before the new tires and Brake Job Truck rode like a car very smooth.

Now we have been back several times for balancing and what not. on the second trio back a wheel was noticed as bent so I put AR-23's on it all the way around. WIder Rim but same tires (Bridgeston Dueler H/L's). Now that the new RIms are on I took it back had it balanced and that lasted about a week, Now the Bounce/Vibration is back and it gets worse the faster you go. Had the Tires CHecked again and Balnce was gfine and now bent rims. The WIfe now hates to driver her truck but hates my Tacoma worse.

Thanks,
Ed[/quote]
-----------------------------------------------------------
Hi, I went through the bounce and balance 5-6 times before an old timer showed me that the way the wheels are mounted on the balancer will cause this. Also the reported bent rims (which aren't really bent).
The quick and easy mounting uses a cone in the center hole of the wheel.
But the wheels center hole is not accurate enough to get it right.

The wheels are centered on the truck by the lug holes so to get it right, the wheel needs to mounted by the lug holes.They need the lug adapter for the balancer and a few more minutes per wheel, which is why they don't do it unless you insist.
I even had the guy at Costco tell me two of my Jackman rims on the old Land Rover were bent... The centers are 1/4" thick. So I called the tire shop manager and after he watched the difference on the machine, he was convinced.
If the center hole was used there can be a lot of weights on the wheel.
And if they take the wheel off the machine after balancing it, then put it back on, the wheel will not be in balance.
It really fixes the bouncing problem.
Bob B

[EA6BMECH]

That was good!!!

[silverado122775]

Damn.. That might fix my problem.. ONe of my rims have more weights than a scuba diver.. I may take this thread to them and have them balance it the way you suggested.

[chevy00]

hey silv122775 if you do this post your results.i have spent alot of money on:
1.rotors and brakes
2.driveshaft supposedly bent new on
3.carrier,and u joints twice
4. tires
this makes sense because everything was fine until new rear tires.bought at dunn tire.brought back several times for balance and each time they were off balance. brought to local shop and they say out of balance week later.each time the vibration moved at differnt speeds but still in the 40-62mph.mine is 2000 2 wheel drive lt 1500 ext. with 300 lbs cap on back. driving me nuts because it was not there when i bought truck thanx

[silverado122775]

I sure will. It may be a couple of weeks before I get to it.

[danowe]

did anyone try this . and what was the results.
it was the roters. bran spanking new roters.

[reborn55]

Great thread---I have 99 Silverado--5.3--2wd--extended cab--89,000 miles. my vibration is intermittent. sometimes ti runs down the road smooth as glass then vibration--coming from driveline--feels like it. Then it go away..might be at 45 mph or 60 mph. Have rotated tires, replaced center bearing, rear ujoint(seemed to be good.) I can go 2-3 days with no problem and then it appears--may last for a second or 2, or until I change speeds. Really no rhyme or reason. I know this is an old post but maybe some more insight can be given. thanks

[Tdragone]

If you're sure it's driveline; forget this.. but my 2002 with 180K miles had a similar intermittent problem that was the inner tie rods in the front. sometimes it was like brand new; other times from mild to death shudder. Speed/rpm didn't matter.

[yakkk]

I've got my own variation on the vibration theme.
Mine's a 2004 Z71 with 90k miles
About a month ago on a long drive, I started noticing a rumble when I stepped on the accelerator, which would go away when I took my foot off and coasted. I can feel it through the whole truck, and sometimes I hear something vibrating behind and underneath me, like a metal plate.

The rumbling has been consistent since then, and only while accelerating. It's there at low speed and at high speed. It's almost like the sort of rumble you get when driving a stick shift and you're going too slow for that gear.

I also have the intermediate steering column vibration, but I've been living with that for a while so I know it's not that.

Other than that the truck is running fine.

I'd appreciate your thoughts.

thx, Jack