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#1 |
Registered User
Join Date: Aug 2015
Location: Snead, AL
Posts: 5
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94 k1500 350 vibration
I just bought a 94 k1500 with a rebuilt 350 in it, and I'm trying to figure out why I'm getting some vibration around 55-60 mph. After playing with it some, I've noticed that the vibration stops as soon as I take my foot off the gas pedal (but I'm still going the same speed), so I'm thinking it must be something more related to the RPM at 55-60 mph in overdrive than the speed. Since it stops when I take my foot off the gas, I'm assuming that it's not the tires or driveline, because they are still spinning at the same rate. Could it be the engine itself? If so, what do I do to correct it? Anyone have any ideas? Thanks.
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#2 |
Registered User
Join Date: Apr 2013
Location: GUNTERSVILLE
Posts: 621
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Re: 94 k1500 350 vibration
In high school I drove a Bronco that would eat u-joints. That was the sign one needed replacing. A vibration under load but I don't remember the speed range. If it were mine I would start there.
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#3 | |
Registered User
Join Date: Oct 2013
Location: New Jersey
Posts: 1,305
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Re: 94 k1500 350 vibration
Quote:
Check the U joints. Paul
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"You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997) |
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#4 |
Registered User
Join Date: Jan 2006
Location: Big Pine Key, FL
Posts: 752
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Re: 94 k1500 350 vibration
X3. It's almost certainly the u-joints. After you replace them, have the driveshaft checked for balance. it's worth the extra $.
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Mike |
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#5 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,204
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Re: 94 k1500 350 vibration
x4. Driveline disturbances are "torque sensitive" (that is, they vary based on load).
K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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#6 |
Registered User
Join Date: Aug 2015
Location: Snead, AL
Posts: 5
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Re: 94 k1500 350 vibration
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#7 |
Registered User
![]() Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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Re: 94 k1500 350 vibration
Do you only hear a vibration? Or do you also feel it?
In my transmission, during the early days, I had a bad LOCK UP in the torque converter. That causes a vibration.... ( not really a noise)....
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#8 |
Registered User
Join Date: Aug 2015
Location: Snead, AL
Posts: 5
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Re: 94 k1500 350 vibration
You hear it pretty loudly, and feel it a little bit.
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#9 |
Registered User
Join Date: Aug 2015
Location: Snead, AL
Posts: 5
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Re: 94 k1500 350 vibration
Still haven't gotten to the u joints, but I've discovered another problem. Don't know if it is appropriate to make a new post, or continue the saga on this one, so I'll start here and if I need to make a new post someone please let me know. It feels like my four wheel drive engages, but the front wheels don't pull. I crawled under it and the actuator isn't wired up. It has 3 wires dangling from it. There are also three wires dangling on the other side of the axle that i assume go to it, but one doesn't look like it is the same color so I'm hesitant to hook them up. I also noticed another pigtail (a 2 wire) on the back side of the axle that is hooked up, but has one wire that is almost torn in two. Anyone know what it does? Any advice on how I should proceed with the actuator and wiring?
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#10 |
Registered User
Join Date: Aug 2015
Location: Snead, AL
Posts: 5
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Re: 94 k1500 350 vibration
Update: 4 wheel drive is fixed. Just wired it back up and all is well. Still haven't had time to install new u joints. The wife keeps assigning me other tasks.
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#11 | |
Registered User
Join Date: May 2015
Location: Montana
Posts: 3,696
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Re: 94 k1500 350 vibration
Quote:
![]() I took out the actuator and stuck a piece of 3/4" PVC pipe about 1" long on the end of the plunger, and then reinstalled the actuator to semi-permanently lock in the front axle. ![]() My pickup is only used for a firewood truck and on local roads, but you can also get a "Posi-Lok" cable control which eliminates all the wiring and the thermal-hydraulic actuator. ![]()
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Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
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1500, 1500 v-eight, 350, shaking, vibration |
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