So for a while now, the blazer has had a rumble... For some reason, it sounds like a transport down shifting while I accelerate. And when it's iddle or coasting, there is no rumble. Does anyone have an idea of what could be the problem?

 

Mine started doing it a couple of weeks ago. Haven't gotten around to looking what the culprit might be but it isn't too terrible. I'll be watching this thread to hopefully see what others come up with.

 

So I finally got internet after being in Florida for 2 days. But right to the point. My drive shaft was the problem. It ended up with a broken driveshaft, ujoint and yoke... Could've spelt the last one wrong... I'm in Florida on vacation so a little tipsy... Now I'm not sure if it was the driveshaft or yoke or ujoint that cause it but I would start with the ujoint.

 

I was thinking a motor mount but when I get the time I'll crawl under and check the drive shafts, too. Thanks for the reply.

 

That was my first thought as well... But it wasn't the case for me. Ever since the shaft and everything was fixed, the blazer now drives like it's new. No rumble, no shake, not a problem. She's lucky too because I'm about to sell her if anything else goes wrong lol. But with all the new parts on it, it's hard to decide.

 

Checked both drive shafts and the motor mounts and all looks good. Guess I've got some trouble shooting to do. May pull the drive shaft and have the balanced checked.

 

Finally pulled the drive shaft and found a tiny bit of slop at the rear u joint. Pulled it out and found one of the bearing had no needle bearing in it, just dust.

Things are much better now!

 

Now I wish I would've checked mine a long time ago! Glad to hear it's all fixed with no major costs.