new Vibration, need help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blake_72_Blazer · 11-10-2003, 08:10 PM

Once I get above 50mph the vibration starts. Vibrations is not only through the steering wheel, but the whole truck. The vibration almost feels like driving real knobby tires or something is out of balance. If I let off the gas the vibration stops and the trucks is still moving over 50mph, but if I get back on the accelerator the vibration starts again. No problems under 50mph.

Any ideas? Where to start?

Blake
http://blakesara.home.comcast.net/K5Photos.htm

jhow66 · 11-10-2003, 11:10 PM

If 2-piece drive shaft check midshaft bearing.

blazerholic · 11-11-2003, 12:56 AM

U-joints, splines where 2 halves of driveshaft go together, pinion bearing maybe. I'm just thinkin it must be something worn that's causing the shake while under torque but not while coasting. Of course, I've had some weird experiences with tire shake before too. What size tires are you running? Axle/wheel bearings could be a factor as well. Hell, just replace everything from the frame down!

LeRoy · 11-11-2003, 02:56 AM

Did you pull out driveline lately? The two u-joints might be outa phase. Is it lifted. How's your front wheel bearing or ball joints doing?

Blake_72_Blazer · 11-11-2003, 01:53 PM

About 3 months again, I replaced ball joints, front bearings, and hubs. No problems after I replaced.
The problem started just last week. I have not removed the driveshaft or any rear parts.
Stock hieght running 32x11.50 on 15x8 rims

My guess are the u-joints on the rear d-shaft.

Blake_72_Blazer · 11-11-2003, 04:01 PM

Problems found. Bad u-joints on rear drive shaft.
Thanks for help.

11-10-2003, 08:10 PM	#1
Blake_72_Blazer Registered User Join Date: Aug 2003 Location: Allen, Texas Posts: 26	new Vibration, need help Once I get above 50mph the vibration starts. Vibrations is not only through the steering wheel, but the whole truck. The vibration almost feels like driving real knobby tires or something is out of balance. If I let off the gas the vibration stops and the trucks is still moving over 50mph, but if I get back on the accelerator the vibration starts again. No problems under 50mph. Any ideas? Where to start? Blake http://blakesara.home.comcast.net/K5Photos.htm __________________ Blake 72 Blazer, 350, tubro 350, NP205, 32x11.5x15 http://home.comcast.net/~blakesara/K5Photos.htm

11-10-2003, 11:10 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	If 2-piece drive shaft check midshaft bearing. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

11-11-2003, 12:56 AM	#3
blazerholic I am a Gov't Mule Join Date: Aug 2003 Location: Latonia,Ky Posts: 276	U-joints, splines where 2 halves of driveshaft go together, pinion bearing maybe. I'm just thinkin it must be something worn that's causing the shake while under torque but not while coasting. Of course, I've had some weird experiences with tire shake before too. What size tires are you running? Axle/wheel bearings could be a factor as well. Hell, just replace everything from the frame down! __________________ ...to die in the saddle must be my destiny, to ride this rockin' horse I must be crazy...

11-11-2003, 02:56 AM	#4
LeRoy Registered truck nut Join Date: Dec 1999 Location: Mt. Vernon, Washington, USA Posts: 1,584	Did you pull out driveline lately? The two u-joints might be outa phase. Is it lifted. How's your front wheel bearing or ball joints doing? __________________ MOUNT VERNON, WASH. STATE Need a part? Just PM me

11-11-2003, 01:53 PM	#5
Blake_72_Blazer Registered User Join Date: Aug 2003 Location: Allen, Texas Posts: 26	About 3 months again, I replaced ball joints, front bearings, and hubs. No problems after I replaced. The problem started just last week. I have not removed the driveshaft or any rear parts. Stock hieght running 32x11.50 on 15x8 rims My guess are the u-joints on the rear d-shaft. __________________ Blake 72 Blazer, 350, tubro 350, NP205, 32x11.5x15 http://home.comcast.net/~blakesara/K5Photos.htm

11-11-2003, 04:01 PM	#6
Blake_72_Blazer Registered User Join Date: Aug 2003 Location: Allen, Texas Posts: 26	Problems found. Bad u-joints on rear drive shaft. Thanks for help. __________________ Blake 72 Blazer, 350, tubro 350, NP205, 32x11.5x15 http://home.comcast.net/~blakesara/K5Photos.htm

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