Off topic: Truck vibration at specific rev level???
06-30-2004, 05:03 PM
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Racer
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Off topic: Truck vibration at specific rev level???
Why does my truck break into a violent resonate vibration at a specific rev level? It's a '93 chevy 1500 series automatic. If I accelerate through the rev level, it's fine...but if I linger at this rev level it feels as if the engine/drive train is gonna shake apart. I just replaced the engine with a Jasper…4.3 liter. 
06-30-2004, 05:29 PM
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Racer
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Re: Off topic: Truck vibration at specific rev level??? (Calm Screamer2)
Did you reused the old engine and transmission mounts? sound like you had a broken engine mount. It happend with my truck when the water pump 's bearing bad too.
06-30-2004, 08:59 PM
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Re: Off topic: Truck vibration at specific rev level??? (Cor6996vette)
does it do this in every gear and in nuetral, or just while in gear? Is it speed related or RPM? Try the same speed in a different gear to change the RPM at that speed.
If it's speed you could have a driveshaft out of phase, out of balance or a bad u-joint, wheels out of round / balance or a bad shock absorber causing the wheel to "dribble". If it's RPM, look at the mounts, and possibly the harmonic balancer.
If it's speed you could have a driveshaft out of phase, out of balance or a bad u-joint, wheels out of round / balance or a bad shock absorber causing the wheel to "dribble". If it's RPM, look at the mounts, and possibly the harmonic balancer.
07-01-2004, 04:04 AM
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Re: Off topic: Truck vibration at specific rev level??? (Calm Screamer2)
My truck (83 1 ton chevy deisel) a couple months ago did SAME as you describe.... 2 days later driveshaft fell out (bad u-joint). Easy item to check... I'd start there.
Good luck,
Loren
