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Old 12-22-2010, 01:36 PM
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85 Chevy Vibration

I have a 85 Chevy 1/2 ton, reg. cab, 2-wheel drive, short bed that has a vibration in it. It gets worse as the RPMs go up. I replaced most everything in the drive train. I had a new GM crate 350 put in it in 08, it had a 305 in it, had the trans. rebuilt, at the same time, replaced the rotors, pads, calipers and the drums in the rear and put a new drive line in it. The wheel bearings all feel good. I ask the shop, that put the new engine in, and that's something I'll never do again, about the balancing damper and they said they put a new one on. Is there a way I can check this? I, also, had the wheels balanced and front-end realigned. So, now I'm stumped. Anyone have any thoughts about what else I can check? Also, seeing as how I bought a new "Crate" engine and had it installed, do I now say I have a 2008 350 engine? When ordering about parts for it.

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Old 12-22-2010, 01:58 PM
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I have a similar truck. Just to confirm, does the vibration go up and down with motor RPM, or vehicle speed? I had a vibe that ended up being a large blister in my front tire. It was visible once the tire shop found it. It was about the same diameter as a baseball.
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Old 12-22-2010, 01:59 PM
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No, your crate engine is likely based off the generation 1 small block chevy and just about all the parts from that era interchange. If you got the basic goodrich crate engine it`s based of the mid 70`s heavy duty parts.
Do you feel the vibration is in the drive train or in the chasis? As there`s many things that can cause it. Did they replace the flexplate? a bum flexplate can cause all kinds of vibration problems.
As for the balancer, there were so many for the generation 1, as long as it`s round with no cut outs, as it`s a "neutral balance" then there`s no problem.
Vibration issues can be in the driveshaft if the balance weight happened to sling off which will be obvious, and it can be in the rear end if there`s any considerably play in the pinion gear. Did this problem occur with the old engine? That`s why I ask if the flexplate was reused. If it had this problem on the old engine and carried on to the new and the flexplate was reused then I`d say you have your culprit. Years ago we were dealing with the same issue, we changed the flexplate and all the vibration went away.
One way we used to test the to where the vibration was coming from was
to be going down a hill, pop it in neutral and let it coast, if the vibration stopped, it`s in the engine, if it continued it`s in the chasis.
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Old 12-22-2010, 02:10 PM
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Quote:
Originally Posted by DoubleVision
One way we used to test the to where the vibration was coming from was
to be going down a hill, pop it in neutral and let it coast, if the vibration stopped, it`s in the engine, if it continued it`s in the chasis.
This is pretty good advice!!! I had some vibration going 60 mph on my Mustang and it ended up being the rear U joint on the driveline. Apparently the U joint cup wasn't seated properly into the rearend yoke. I just replaced the U joint and no more vibration.
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Old 12-22-2010, 08:40 PM
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If no vibration in neutral, DoubleVision method, hit the brakes and see if that starts up the noise. The 85 shortbed has a one piece, super long drive shaft. The limit for one piece props. Make sure those U joints are not froze, common with the prop shaft loading. The skinny shaft also bows over time, there might be a recall. This is not a 42" camaro drive shaft, this is a 62" + bow.
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