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02-08-2012, 08:54 PM
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#1 |
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Registered User
Join Date: Feb 2012
Location: Whittier CA
Posts: 8
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I can't go past 60 mph on the freeway
Whenever I try accelerating past 60 my truck starts to vibrate & I hear a low humming noise I'm afraid to push it further, any ideas what it could be...?
Posted via Mobile Device |
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02-08-2012, 09:02 PM
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#2 |
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Registered User
Join Date: Mar 2010
Location: Edgewater NJ
Posts: 159
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Re: I can't go past 60 mph on the freeway
Tires and wheels in balance and not out of round?
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02-08-2012, 09:18 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: Northwest, NJ
Posts: 195
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Re: I can't go past 60 mph on the freeway
My guess would be universals. Try accelerating up a hill and then on the downside, lift your foot off the gas pedal. If the vibration goes away while coasting, the universal or universals are bad.
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02-08-2012, 09:45 PM
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#4 |
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Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: I can't go past 60 mph on the freeway
I agree the most obvious possibilities are tires or u-joints. If the joints are good, it could also be the driveshaft is either bent or out of balance or you could even have an imbalance in the engine. If you have a long bed with a two piece driveshaft it’s likely the bearing in the center is the problem. They are frequently neglected far more than the end joints.
Once the vibration is eliminated, if the truck still won’t go fast enough the universal solution is to take a small hammer and break the speedometer glass. Turn the speedo needle all the way to the top and the vehicle will accelerate like a rocket! Rocky and Bullwinkle showed how to do it back in the 60’s. 
Last edited by markeb01; 02-08-2012 at 09:59 PM. |
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02-08-2012, 11:25 PM
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#5 | |
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Registered User
Join Date: Nov 2008
Location: Lacombe, LA
Posts: 2,772
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Re: I can't go past 60 mph on the freeway
Quote:
__________________
http://s1299.photobucket.com/user/jb...23904108567829 |
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02-09-2012, 12:04 AM
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#6 |
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Registered User
Join Date: Nov 2007
Location: Glasgow, Kentucky
Posts: 14
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Re: I can't go past 60 mph on the freeway
I wish my truck could go faster than 60...
__________________
2000 RCSB lowered and boltons 1964 GMC ton 305v6 1985 Monte Carlo v8 all o.e. 1989 240sx pignose coupe 2007 klx |
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02-09-2012, 12:23 AM
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#7 |
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SIR
Join Date: Apr 2005
Location: grants pass oregon,usa
Posts: 658
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Re: I can't go past 60 mph on the freeway
TAKE IT OUT OF 1st GEAR...
__________________
66long low fleet http://community.webshots.com/user/LVNR66 |
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02-09-2012, 12:16 PM
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#8 |
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Registered User
Join Date: Feb 2012
Location: Whittier CA
Posts: 8
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Re: I can't go past 60 mph on the freeway
Yup as soon as I let off the gas when I push it the vibration stops
Posted via Mobile Device |
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02-09-2012, 12:20 PM
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#9 |
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Registered User
Join Date: May 2005
Location: Beaverton, OR
Posts: 3,728
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Re: I can't go past 60 mph on the freeway
My truck stock did about 58 unless it was downhill.
__________________
New Project: 1966 LWB C20 Plans: 1/2 ton conversion Dropmember front Dropmember rear Corvette discs Restored raised bed http://67-72chevytrucks.com/vboard/s....php?p=4295210 |
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02-09-2012, 06:45 PM
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#10 |
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Registered User
Join Date: Feb 2007
Location: Phoenix Az
Posts: 432
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Re: I can't go past 60 mph on the freeway
I rarely take mine over 55 even with no vibrations
__________________
Rockin' a '66 and loving every minute of it 
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