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11-04-2010, 06:25 AM
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#1 |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Wobble at 65mph?
My '73 has been wobbling in the back somewhere since I got it last month. 55mph is nice and smooth, 65mph sounds like I'm driving on one of those stips on the highway that are supposed to wake you up. Once I'm up to about 70mph it's gone again, all the way up to at least 100. (damn, I'm impressed my truck made it to 100!
 ) It doesn't have anything to do with engine RPMs, only speed.Anyway, I thought my 33" tires probably need to be balanced. And the tread keeps picking up peices of gravel. Today I noticed that at 65mph the shifter handle on the t-case wobbles in tune with the rest of the truck. This makes me think maybe it's not the tires? Anyone have any thoughts? Could it be my drive shaft? For some reason the rear shaft is bigger than any other I've seen, like 6-8" in diameter. What's with that?
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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11-04-2010, 10:20 AM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,277
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Re: Wobble at 65mph?
im going to bet its the driveshaft ... especially if its one of those two piece jobs with the carrier bearing.... those carriers will do wierd stuff like that
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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11-04-2010, 05:05 PM
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#3 | |
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'87
Join Date: Jun 2004
Location: Katy, TX
Posts: 632
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Re: Wobble at 65mph?
Quote:
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11-04-2010, 08:40 PM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Wobble at 65mph?
My truck only has the 1 peice drive shaft.
__________________
'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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11-07-2010, 10:58 AM
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#5 |
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Registered User
Join Date: Nov 2008
Location: edmonton, alberta
Posts: 293
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Re: Wobble at 65mph?
if it was worn u-joints on the drive shaft, you'd definitely hear it. Since there is no noise, I'm guessing tire/rim issues.
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 76 Silverado, 2wd, long box, 350/th350, 3.42 posi, edelbrock performer 64cc heads, edelbrock 1405, 2101 intake, Hedman Headers, Comp Cam XE262 http://beerbreadbike.wordpress.com/ |
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11-07-2010, 01:32 PM
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#6 |
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Arrived on a Pale Horse
Join Date: Mar 2007
Location: SnagTown Indiana
Posts: 2,524
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Re: Wobble at 65mph?
May be a balance issue with one of the tires.
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Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW |
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11-07-2010, 05:13 PM
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#7 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Wobble at 65mph?
Vibrations that occur at around 45-55 MPH are almost always tire related. You probably have a tire that is out-of-round or possibly a bent wheel?
Your "65" if un-corrected for the tire diameter is going to put you down closer to that speed range....
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Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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11-07-2010, 08:39 PM
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#8 | |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Wobble at 65mph?
Quote:
I guess it wouldn't hurt to have the tires balanced though....
__________________
'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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