Bad vibration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

19seventeeCustom · 07-09-2010, 04:26 PM

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

storm9c1 · 07-09-2010, 04:56 PM

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.

19seventeeCustom · 07-09-2010, 05:37 PM

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?

tim21391 · 07-09-2010, 06:10 PM

tires not balanced right?

cdowns · 07-09-2010, 06:52 PM

tires would b the first thing i'd check

19seventeeCustom · 07-09-2010, 07:09 PM

thanks for the quick reply guys, ill see what I can come up with.

pro1955 · 07-09-2010, 07:45 PM

Pinion angle.

19seventeeCustom · 07-09-2010, 07:48 PM

what does the pinion angle need to be set at on a stock truck with a 700r?

rsavage · 07-09-2010, 09:24 PM

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.

smallblockchev · 07-10-2010, 03:30 AM

even front suspension being worn. check your tie rods and ball joints

19seventeeCustom · 07-10-2010, 11:22 AM

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

storm9c1 · 07-10-2010, 01:44 PM

Quote:

Originally Posted by 19seventeeCustom

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

Yes, you will have to systematically check this stuff.

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.

grs · 07-10-2010, 03:44 PM

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.

19seventeeCustom · 07-10-2010, 04:27 PM

would a 1 piece driveshaft work better for my application, or do you guys prefer the 2 piece?

grs · 07-10-2010, 04:45 PM

I put a 1 piece drive shaft in my truck. I don't have to worry about the carrier bearing any more.

storm9c1 · 07-10-2010, 04:51 PM

Quote:

Originally Posted by grs

I put a 1 piece drive shaft in my truck. I don't have to worry about the carrier bearing any more.

...............

07-09-2010, 04:26 PM	#1
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	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

07-09-2010, 04:56 PM	#2
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	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.

07-09-2010, 05:37 PM	#3
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	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?

07-09-2010, 06:10 PM	#4
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	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

07-09-2010, 06:52 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	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

07-09-2010, 07:09 PM	#6
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	Re: Bad vibration thanks for the quick reply guys, ill see what I can come up with.

07-09-2010, 07:45 PM	#7
pro1955 Registered User Join Date: Apr 2009 Location: Rochester Wa. Posts: 68	Re: Bad vibration Pinion angle. __________________ Truck's just for the fun of it.

07-09-2010, 07:48 PM	#8
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	Re: Bad vibration what does the pinion angle need to be set at on a stock truck with a 700r?

07-09-2010, 09:24 PM	#9
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	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.

07-10-2010, 03:30 AM	#10
smallblockchev Registered User Join Date: Jun 2010 Location: Bemidji, MN Posts: 65	Re: Bad vibration even front suspension being worn. check your tie rods and ball joints __________________ 2007 Chevy 2500HD all stock 1985 Chevy Blazer- sold 1971 Chevy c10- The Mistress 2014 Ford Interceptor SUV

07-10-2010, 11:22 AM	#11
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	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

07-10-2010, 03:44 PM	#13
grs Registered User Join Date: Jan 2010 Location: Roanoke, Tx. Posts: 1,561	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.

07-10-2010, 04:27 PM	#14
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	Re: Bad vibration would a 1 piece driveshaft work better for my application, or do you guys prefer the 2 piece?

07-10-2010, 04:45 PM	#15
grs Registered User Join Date: Jan 2010 Location: Roanoke, Tx. Posts: 1,561	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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