1997 GMC K1500 Z71 140,000 miles V8 5.7 with a vibration

RJD2434

MEMBER
1997 GMC C1500

Yes, I have a 1997 GMC K1500 Z71. When I go around 45 mph and start to coast, the truck starts to have a slight vibration. The vibration is not felt in the steering wheel, but is felt in the seat and passenger seat. It also has the same vibration problem when going down the highway around 55 to 65 mph. What could this be? It's not the rotors we just replaced them. Wondering if it needs realignment or what?

Monday, June 4th, 2007 AT 10:44 AM

2 Replies

TJINCA

MEMBER
2 POSTS

Start with the obviuos ( I spent 13 years in the tire, front end business) Check your Lug nuts on the front wheels since you just had rotors replaced. The second thing I would look at is your Driveline here is where you would most likly feel the vibrations under your seat. Pull it and have the balanced check. Last thing I can think of. Did they rotate your tires while getting rotors put on? Did they Balance them? Rear wheels could be out of balance. Hope that can help those are the three most common things I have dealt with. If you don't feel it in the steering most likly its Not the front end or alignment.

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Monday, June 4th, 2007 AT 8:46 PM

DANIMALGMC

MEMBER
33 POSTS

How many miles are on it?
Have you checked your U-joints?
Also, if you have a good amount of miles, you might check the tranny and all the other mounts that hold the drive train in. A loose bolt could result in vibration.
I had a lifted Blazer and I could tell you from how the vibration felt that I had a U-joint going.

Good Luck

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Tuesday, July 3rd, 2007 AT 9:31 AM