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#1 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Not so good vibrations
As I've been driving my ol' 70 more, I've noticed a vibration. It's not a steady vibration, more intermittent. It feels like it's coming from the drivetrain, but I'm not sure. Besides U-joints, what else do I need to consider? Also, is it bad to drive it very far like this? Sometimes I take it to work (60 miles round trip).
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#2 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Not so good vibrations
Mine had a vibration caused by defective Transmission mount. Replaced it and much smoother....
It wasn't intermittent but did increase with speed or RPM.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#3 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Not so good vibrations
Mine changes with speed too. There's about 5-6 seconds between each vibration.
Could it be something wheel related? I had the rear wheels balanced when I had the bigger tires put on, but it was vibrating some before then. I'm just curious if I can still drive it the way it is? Posted via Mobile Device
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#4 |
Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Not so good vibrations
Maybe the driveshaft is not balanced correctly?
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,594
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Re: Not so good vibrations
2 piece driveshaft has a steady bearing in the middle.
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#6 |
Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,682
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Re: Not so good vibrations
Check your pinion nut, also see if you have a bunch of slop in your ring & pinion. I had a similar "harmonic" vibration in a 12 bolt rear in my Malibu. Found out the back lash was way off.
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#7 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: Not so good vibrations
Driveshafy vibration. Ok so you already know the ujoints could be bad, good. If its a one piece the tranny yoke could have been flipped 180* and cause a vibration
If 2 piece tranny yoke could have been flipped, bolt on yoke could have been turned to one of the 8 or so wrong positions, rear driveshaft could be flipped 180* or in completely backwards. If it has a slip yoke it could be turned to one of the 20 or so wrong positions. Oh then you have physical damage like dents, bends in the tubing worn weld yokes, bad ujoints, failed carrier bearing, worn tranny yoke, worn tranny bushing. Or if you have it a worn slip and stub. If you narrow it down to the driveshaft and value your time and money take it to a pro, if i t needs ujoints get good ones, and have it ballanced. As you're aware there's plenty of other things it could be. Good luck. Posted via Mobile Device
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#8 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Not so good vibrations
Didn't say whether your truck is auto trans or manual, or if it is 10, 20, 30 series.
Do you have the vibration when coasting - try it downhil? If so, that could eliminate thrust issue in driveline. If this vibe came on rather suddenly and occurs mainly when there is thrust on, I would check, in this order: Loose/worn U joints Loose/cracked Trans and Motor mounts Carrier bearing wear (if you have one) After those, would seem to be drive shaft misbalance, trans output issue (as noted by someone earlier), begining of flex plate breakage in auto trans, or wear in the diff assy. This is not usually manual trans/clutch issue. Good luck
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#9 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Not so good vibrations
Sorry, here's the details: 1970 C20 - 350, TH350, 4.10
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#10 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Not so good vibrations
OOOOHHHH I just thought of something else. I have seen some of the driveshafts that have a keyed center and some without. Could your front and rear driveshaft be clocked wrong??
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#11 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Not so good vibrations
Thanks for all the great ideas guys!
Still, part of my original question was: can it still be driven (somewhat reliably) the way it is? I am going to have it fixed, I just want to be able to drive it in the meantime, until I have time/money to have a professional take a look at it. I love driving the thing. Posted via Mobile Device
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#12 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Not so good vibrations
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#13 |
Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Re: Not so good vibrations
My truck shakes at higher rpms but does it while parked too so I'm sure it isn't the drive shaft on mine anyway. The biggest concern of course is causeing more damage than there is depending what it is if u snap a u joint and loose ur drive shaft obviously ur stuck if its a mild vibration and everything looks ok and ur just getting by for a short time in "my" opinion if it was me I might baby it but not for long bigger problems may happen
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#14 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Not so good vibrations
Ok, that's what I thought. I'll have to do some investigating tomorrow morning.
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#15 | |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: Not so good vibrations
Quote:
Some vibrations are less serious obviously, but your truck shouldn't Vibrate much, its obviously not a new toyota, but the vibration is a warning sign that something has gone wrong or something is about to go seriously wrong. Its always cheaper to fix a small problem than to fix a small problem and whatever else it takes out. Posted via Mobile Device
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#16 | |
Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Re: Not so good vibrations
Quote:
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