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#1 |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,672
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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"?
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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... |
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#2 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,766
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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
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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 |
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#3 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,117
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Re: Vibration between ~55-65mph
Check the U-joints on your driveshaft.
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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 RIP FleetsidePaul |
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#4 |
It's all in the timing
Join Date: May 2009
Location: Lake Mary,Florida
Posts: 600
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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.
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#5 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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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.
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'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" |
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#6 |
Gone to greener pastures
![]() Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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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
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'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 |
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#7 |
Skinned knuckles
Join Date: Oct 2006
Location: Longview, Washington
Posts: 1,126
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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.
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'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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