55+ vibration - Help - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

garyd1961 · 02-27-2022, 07:56 PM

I'm a tire guy and all I can add is rotate your tires front to rear. If it's a tire problem the vibration should move from your seat to the steering wheel. I know you said you tried balancing your old tires and it still vibrated but I have seen more than one set of new tires that were so out of round you just couldn't balance them.
Oh, I forgot to say I had a 383 that someone left the bolt out of the balancer and started to wobble on the crank. Also double check to make sure you have the right flexplate for the motor, internally balanced vs externally balanced.

tdangle · 03-01-2022, 02:29 PM

Quote:

Originally Posted by garyd1961

I'm a tire guy and all I can add is rotate your tires front to rear. If it's a tire problem the vibration should move from your seat to the steering wheel. I know you said you tried balancing your old tires and it still vibrated but I have seen more than one set of new tires that were so out of round you just couldn't balance them.
Oh, I forgot to say I had a 383 that someone left the bolt out of the balancer and started to wobble on the crank. Also double check to make sure you have the right flexplate for the motor, internally balanced vs externally balanced.

It would be great if it was the tires. Unfortunately it isn't. Same vibration with old tires, new tires, rebalancing, road force rebalancing, swapping out wheel and tire with another set. And not engine speed related. Same vibration in 3rd and OD at the same speed, also if I shift to neutral. No vibration in steering wheel, def coming from back. Jack up and put rear end on jack stands same vibration at the same indicated speed on the speedo. At this point I'm starting to think it is in the rear end. Uggg.

**'68OrangeSunshine** · 03-01-2022, 03:25 PM

Quote:

Originally Posted by Grumpy old man

I started noticing a vibration at 55+ at 57 + it turned into a creaking sound ,Now at 60 + it's just a limp ...

They say whiskey is good for that.

**HO455** · 03-01-2022, 04:30 PM

I had a lot of NVH in my Burban when I first got it running. A rebuilt drive shaft with an aftermarket carrier bearing took care of about half of it. The rest was coming from the rear end.

In the end we found the posi carrier case and the spider gears were disintegrating. (Photo below) In addition one axle had had a bearing fail at some point and it had a speedi-sleeve installed over the bad spot on the axle.

Fortunately I got it fixed before the ring and pinion or the housing were damaged.

As previously mentioned it would be worthwhile to pull the cover off for an inspection. Personally I would pull the axles and inspect the bearings at that point for peace of mind.

Good luck and please keep us in the loop.

Moore87 · 03-02-2022, 07:25 PM

Did you install the 2 piece shaft in the correct phase?

tdangle · 03-03-2022, 12:47 AM

Quote:

Originally Posted by Moore87

Did you install the 2 piece shaft in the correct phase?

Yes the driveline company that balanced it market it for me. Also this was the 2nd time the drive shaft was worked on. Earlier I had it completely rebuilt with new trans yoke, u-joints, carrier bearing and actually new front half of shaft that needed replacing. No change at that point. then I swapped out the 2004r I had for a built 7004r which meant I had to have the drive shaft shortened and then they rebalanced it again. I even enquired about the equip they used and was told they have a spicer built balancer setup which spins up the driveshaft to 3500 during balancing.

BigBird05 · 03-03-2022, 05:59 AM

Since you are chasing gremlins, what about the transmission output shaft bushing?

tdangle · 03-03-2022, 12:18 PM

Quote:

Originally Posted by BigBird05

Since you are chasing gremlins, what about the transmission output shaft bushing?

Vibration didn't change when I installed a different trans in. Went from 2004r to a built 7004r

SCOTI · 03-04-2022, 11:24 AM

I know you swapped wheels front to rear for validation. What about checking to see if the vibration is still apparent w/no rear wheels? Was there any notable difference? Try again w/no drums.

tdangle · 03-26-2022, 09:39 PM

OK, I think I found the source of the vibration. While I was installing pinion shims to raise the pinion a couple of degrees, I found that the leaf spring bushings are pretty much shot. when I unbolted the rear end from the leaf springs much to my surprise they had a lot of play in the bushings. Looks like the bushing had froze and was pivoting on the bolt. needless to say I have Hugh gouges in the brackets. that the leafs bolt to. I'm going to fill with weld, and install new bushings first and see if it's fixed.

**HO455** · 03-27-2022, 05:49 PM

If nothing else it will certainly help the truck drive straight on poor roads.

02-27-2022, 07:56 PM	#26
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: 55+ vibration - Help I'm a tire guy and all I can add is rotate your tires front to rear. If it's a tire problem the vibration should move from your seat to the steering wheel. I know you said you tried balancing your old tires and it still vibrated but I have seen more than one set of new tires that were so out of round you just couldn't balance them. Oh, I forgot to say I had a 383 that someone left the bolt out of the balancer and started to wobble on the crank. Also double check to make sure you have the right flexplate for the motor, internally balanced vs externally balanced. Last edited by garyd1961; 02-27-2022 at 08:10 PM.

03-01-2022, 04:30 PM	#29
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 55+ vibration - Help I had a lot of NVH in my Burban when I first got it running. A rebuilt drive shaft with an aftermarket carrier bearing took care of about half of it. The rest was coming from the rear end. In the end we found the posi carrier case and the spider gears were disintegrating. (Photo below) In addition one axle had had a bearing fail at some point and it had a speedi-sleeve installed over the bad spot on the axle. Fortunately I got it fixed before the ring and pinion or the housing were damaged. As previously mentioned it would be worthwhile to pull the cover off for an inspection. Personally I would pull the axles and inspect the bearings at that point for peace of mind. Good luck and please keep us in the loop. Attached Images __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 03-04-2022 at 10:42 AM. Reason: Found the photo to add.

03-02-2022, 07:25 PM	#30
Moore87 Registered User Join Date: Dec 2009 Location: Waco, TX Posts: 102	Re: 55+ vibration - Help Did you install the 2 piece shaft in the correct phase?

03-03-2022, 05:59 AM	#32
BigBird05 Registered User Join Date: Aug 2019 Location: Cheraw Posts: 1,300	Re: 55+ vibration - Help Since you are chasing gremlins, what about the transmission output shaft bushing?

03-04-2022, 11:24 AM	#34
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,068	Re: 55+ vibration - Help I know you swapped wheels front to rear for validation. What about checking to see if the vibration is still apparent w/no rear wheels? Was there any notable difference? Try again w/no drums. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

03-26-2022, 09:39 PM	#35
tdangle Registered User Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,210	Re: 55+ vibration - Help Update OK, I think I found the source of the vibration. While I was installing pinion shims to raise the pinion a couple of degrees, I found that the leaf spring bushings are pretty much shot. when I unbolted the rear end from the leaf springs much to my surprise they had a lot of play in the bushings. Looks like the bushing had froze and was pivoting on the bolt. needless to say I have Hugh gouges in the brackets. that the leafs bolt to. I'm going to fill with weld, and install new bushings first and see if it's fixed. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

03-27-2022, 05:49 PM	#36
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 55+ vibration - Help If nothing else it will certainly help the truck drive straight on poor roads. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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