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07-09-2010, 04:26 PM
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#1 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Bad vibration
Hey guys,,, I recently picked up a 70 c-10 with a 350/700r combo and love the truck. The only thing is I have a bad vibration around 45-60 Mph. My truck shakes the hell out of me around those speeds.
You can be at a constant 50mph and be just fine, then i guess when the throttle is pressed to maintain/gain speed it start to shake violently. Any ideas? Tires? Driveshaft? something else? The truck still has a 2 piece driveshaft is that causing an issue with the 700r? please help guys.....i dont know where to start |
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07-09-2010, 04:56 PM
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#2 |
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*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Bad vibration
I would suspect drive shaft. Or U-joints. Check all of that carefully, or better yet, have the shaft checked by a shop for balance. Could also be other things (diff, bearings, tires). But that was my first thought.
__________________
Tom  Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... Last edited by storm9c1; 07-09-2010 at 05:02 PM. |
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07-09-2010, 05:37 PM
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#3 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Bad vibration
okay,, ill check those out first,, although I have looked at the u-joint and they dont seem to be loose at all,, what is the proper way to check a u-joint?
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07-09-2010, 06:10 PM
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#4 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: Bad vibration
tires not balanced right?
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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07-09-2010, 06:52 PM
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#5 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Bad vibration
tires would b the first thing i'd check
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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07-09-2010, 07:09 PM
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#6 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Bad vibration
thanks for the quick reply guys, ill see what I can come up with.
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07-09-2010, 07:45 PM
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#7 |
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Registered User
Join Date: Apr 2009
Location: Rochester Wa.
Posts: 68
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Re: Bad vibration
Pinion angle.
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Truck's just for the fun of it. 
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07-09-2010, 07:48 PM
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#8 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Bad vibration
what does the pinion angle need to be set at on a stock truck with a 700r?
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07-09-2010, 09:24 PM
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#9 |
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Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: Bad vibration
You have an OD. Is your converter lockup acting up? Also, try turning the rear section of the drive shaft (assuming 2 piece) 180 degrees at the rear differential ujoint. Sometimes if the ujoint axis's aren't opposite it will cause a bad vibration.
__________________
1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 Last edited by rsavage; 07-09-2010 at 09:28 PM. |
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07-10-2010, 03:30 AM
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#10 |
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Registered User
Join Date: Jun 2010
Location: Bemidji, MN
Posts: 65
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Re: Bad vibration
even front suspension being worn. check your tie rods and ball joints
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2007 Chevy 2500HD all stock 1985 Chevy Blazer- sold 1971 Chevy c10- The Mistress  2014 Ford Interceptor SUV |
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07-10-2010, 11:22 AM
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#11 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Bad vibration
thanks guys,, you guys are awesome
I recently replaced/checked most of the front end components, everything seems to be very tight. The converter lock up works great, never noticed anything out of the ordinary from that, seems to work perfect. I'll have to check the other stuff... gonna start with tires and driveshaft and move on from there. I didnt do any of the work on the truck so i could be alot of things i suppose |
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07-10-2010, 01:44 PM
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#12 | |
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*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Bad vibration
Quote:
When I had that problem years ago, I struggled to find the cause. I tried everything, from tires, to diff bearings, to wheel bearings, to trans mounts and engine mounts. Eventually the tail section of my trans cracked due to the vibration (which pretty much told me what I needed to know), so I had my trans shop fix that and send the drive shaft out for balance. Sure enough, even though the shaft was straight as an arrow, it was out of balance. They rebalanced it and smooth running ever since.
__________________
Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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07-10-2010, 03:44 PM
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#13 |
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Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: Bad vibration
When I bought my truck one of the back wheels was on crooked. It shook at 55 to 65 really bad. I drove it 400 miles home that way. Get the truck off the ground, and spin the wheels. See if they are straight, or not. Good luck.
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07-10-2010, 04:27 PM
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#14 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Bad vibration
would a 1 piece driveshaft work better for my application, or do you guys prefer the 2 piece?
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07-10-2010, 04:45 PM
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#15 |
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Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: Bad vibration
I put a 1 piece drive shaft in my truck. I don't have to worry about the carrier bearing any more.
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07-10-2010, 04:51 PM
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#16 | |
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*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Bad vibration
Quote:
__________________
Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... Last edited by storm9c1; 07-10-2010 at 04:52 PM. |
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