I did quite a few searches on here, but I think my problem is a little different. I have a vibration that I can feel on the driver's side in the first 1-2 secs of acceleration. Right after that, it's gone and it is not heard again, until sometimes when braking. I have been told that I definitely need new brakes, and I am about to have them replaced soon. I thought it would be related to the brakes, but there is something that has me wondering. I know that it is definitely not the hub bearings, because I just had 2 brand new National front hubs put on about 3-4 weeks ago. The sound was there before having the hubs put on.

When the truck is cold in the morning, you can hear it just by tapping the gas pedal. Also, in the morning, since the truck has high rpms, if you drive a little, and then when you put it in Park, when the rpms go up a little from going into park, you can hear it right when the rpms go up after putting it in park for about 1 sec., and when the rpms quickly get normal, the sound goes away. This is why I am not sure if it could be the brakes, since the truck is not moving after it has been put into Park. I would appreciate any advice.

 

Does anyone know what it might be?

 

Are you talking about a vibration or a rattle? You post kind of goes in 2 different directions lol.

 

If you can feel it after putting the vehicle in park (the same vibration), then the issue has nothing to do with your wheels, tires, or drivetrain... It has to be something amiss with the engine. Possibly a blown out motor mount...

 

It's kind of hard to explain. I know I can hear it on the driver's side.

lol That's one of the things that I was thinking. But could it also be the fan clutch?