Vibration between ~55-65mph - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brad · 06-20-2009, 12:35 PM

I have a nasty seat-o-the pants vibration that I feel between about 55-65mph. I don't feel it before that and it diminishes after 65 although the vibration cycle increases with overall speed. The vibration is more of a shudder that happens about 1 every second at 55-60mph and then the rate increases the faster I go yet it feels smoother the faster I go.

I've had my wheels balanced several times at 2 different shops. Could it be my driveline? I've noticed it sticks out about 1-1/2" and most dl shops recommend 3/4"?

**Classic Heartbeat** · 06-20-2009, 02:54 PM

Could very well be your problem. Didn't you tell me you have a single piece driveline? What is the diameter? WES

**leddzepp** · 06-20-2009, 03:26 PM

Check the U-joints on your driveshaft.

1970 Bowtie · 06-20-2009, 04:33 PM

I agree with LeddZepp,I would check the U-Jionts.Also your drive shaft may be out of balance,I would have it checked.If you replace the U-jionts and your drive shaft is not balanced correctly they will just wear out again.

Sammy · 06-20-2009, 10:42 PM

Firedogs 68 had a vib between 65 n 70 then the tranny went out. Replaced the tranny n torque converter now no more vibs at any speeds. Just wanted to throw that out there. But I'd check the rest of the driveline first.

**El Jay** · 06-21-2009, 03:42 AM

Brad,
Check your carrier bearing and check your drive shaft/U-joints to make sure that they are "in phase."

Larry

Blue'72 · 07-13-2009, 01:57 PM

Something I've recently learned.. Loosen your rear u-joint at the axle and see if it slides back and forth. The u-joint needs to fit tightly in between the nubs on the "yolk" on the rearend. If not, it needs to be replaced.

06-20-2009, 12:35 PM	#1
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,673	Vibration between ~55-65mph I have a nasty seat-o-the pants vibration that I feel between about 55-65mph. I don't feel it before that and it diminishes after 65 although the vibration cycle increases with overall speed. The vibration is more of a shudder that happens about 1 every second at 55-60mph and then the rate increases the faster I go yet it feels smoother the faster I go. I've had my wheels balanced several times at 2 different shops. Could it be my driveline? I've noticed it sticks out about 1-1/2" and most dl shops recommend 3/4"? __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

06-20-2009, 02:54 PM	#2
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Vibration between ~55-65mph Could very well be your problem. Didn't you tell me you have a single piece driveline? What is the diameter? WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

06-20-2009, 03:26 PM	#3
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,996	Re: Vibration between ~55-65mph Check the U-joints on your driveshaft. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

06-20-2009, 04:33 PM	#4
1970 Bowtie It's all in the timing Join Date: May 2009 Location: Lake Mary,Florida Posts: 600	Re: Vibration between ~55-65mph I agree with LeddZepp,I would check the U-Jionts.Also your drive shaft may be out of balance,I would have it checked.If you replace the U-jionts and your drive shaft is not balanced correctly they will just wear out again.

06-20-2009, 10:42 PM	#5
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Vibration between ~55-65mph Firedogs 68 had a vib between 65 n 70 then the tranny went out. Replaced the tranny n torque converter now no more vibs at any speeds. Just wanted to throw that out there. But I'd check the rest of the driveline first. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

06-21-2009, 03:42 AM	#6
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Vibration between ~55-65mph Brad, Check your carrier bearing and check your drive shaft/U-joints to make sure that they are "in phase." Larry __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

07-13-2009, 01:57 PM	#7
Blue'72 Skinned knuckles Join Date: Oct 2006 Location: Longview, Washington Posts: 1,126	Re: Vibration between ~55-65mph Something I've recently learned.. Loosen your rear u-joint at the axle and see if it slides back and forth. The u-joint needs to fit tightly in between the nubs on the "yolk" on the rearend. If not, it needs to be replaced. __________________ '72 C-10 longbox soon to be short step! '72 Chevelle (sold in January) '07 Sebring '01 Ranger (I've gotta long commute..) If you try to fail, and succeed, which have you done? My build thread - http://67-72chevytrucks.com/vboard/s...d.php?t=276904



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