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Astro van engine/trany vibration

ANTHONYTRKR

By ANTHONYTRKR
in Ask A GM Technician

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ANTHONYTRKR New Member

ANTHONYTRKR

Posted
Posted

Can you please help? I just bought this 2001 Astro awd van with 4200k miles on it and the engine + trans. vibrates hard under mid. to full throttle. Under light acceleration I don't have this problem. I bought this van from a G.M. dealership and they flushed the trans + replaced with what they called the blue fluid. The engine, and trany mount , and u joints look ok, but I did'nt have time to drop the shafts. they appear to be tight. Astro vans are not easy to service. Also I get vibration from the rear end on smooth road at 60 to 75 mph. The tires where rotated and balanced. Can you tell me what updated fluids I need to use in the trans, transfer case, rear end, and third member? Any help please. :cheers:

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

The autotrak "blue" fluid is the latest for the transfer case. No updated fluids for any other components.

 

Sounds like there's possibly a clutch pack problem in the transfer case. Was the mileage you stated correct? Only 4,200 kilometers on a 2001?

 

We don't see any problems with these, but there's not a lot of AWD Astros around either. The biggest problem we see is with people putting different sized tires on one axle. The fronts and rears MUST have IDENTICAL sized tires. Even brand new tires on one end and totally worn out tires on the other end can result in some problems.

I-H8-4Ds Enthusiast

I-H8-4Ds

Posted
Posted

My company has 2 AWD astro vans that are 2001 models. They both seem to have a low "rumble / hum" sound to them all the time at freeway speeds. I'm sorry I can't be of any more help there, but maybe it's just a resonance or vibration that wasn't well addressed in the design. ???????????????

Jarv New Member

Jarv

Posted
Posted
My company has 2 AWD astro vans that are 2001 models.  They both seem to have a low "rumble / hum" sound to them all the time at freeway speeds.  I'm sorry I can't be of any more help there, but maybe it's just a resonance or vibration that wasn't well addressed in the design.  ???????????????

 

 

 

I dont know if anyone can post here but I am going to give it a try.

I recently had the same vibration problem with my 2004 2500HD 4x4. The dealership ended up calling a GM engineer to come and drive my truck. The problem was the exhaust. They bolted a vibration dampener to the muffler which eliminated the majority of the vibration. The engineer said that they have to use the dampener on a lot of the Astro vans because of the muffler drone coming from the 6 cylinder's.

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