vibration in gas pedal

[mcioci]

I checked the pitman arm and it wasnt loose. I changed both front and rear diff fluid and i still have that slight vibration bet 30 - 50mph. It happens anywhere bet those speeds. It not a big vibration but i feel it because its my truck. Dont know what else to try.

[mcioci]

I took truck for a nice 100 mile ride yesterday and concentrated on the vibration in gas pedal. While accelerating you can feel a lot of vibration bet 20-55mph. I put it on cruise and touch gas pedal with foot and I still felt it but not as bad as when accelerating. Could it be exhaust? Cats? Tranny? I dont know what else to try.

[mcioci]

So this weekend I'm driving my truck on highway and not only do I feel the vibration in pedal at 40mph but now bet 55-65mph, I hear a droning sound. Brought it to dealer to take a drive with mechanic, he thinks its a hub bearring. Lets hope this is the cause of this vibration and drone sound. Need it fixed today because I am driving down to South Carolina early Tues morning. I will post the outcome later.

[mcioci]

its not the wheel bearrings. They said its something with the front differential. Does anyone have any experience with fixing the front differential?

[devilsfan]

All I know is good luck in finding a new one. It's currently back ordered through Hummer. 15 dealers in the country have ONE in stock and aren't happy about parting with it. I needed a new one a month ago, my shop managed to find one in Michigan from a dealer who had 2 in stock. Junkyard might be your best bet.

[mcioci]

Originally Posted by devilsfan

All I know is good luck in finding a new one. It's currently back ordered through Hummer. 15 dealers in the country have ONE in stock and aren't happy about parting with it. I needed a new one a month ago, my shop managed to find one in Michigan from a dealer who had 2 in stock. Junkyard might be your best bet.

Do the Hummer dealers rebuild these diffs? Or do they just buy rebuilt ones and install them? Are rebuilt diff's not reliable?

[mcioci]

Now dealer says they dont know what the noise is. They are not sure its the front diff. They were saying it might be coming from my roof cage or front brush grille. I said how could that be? The noise is from 45-65mph and on acceleration. I said since the vibration is in pedal and noise is definitely coming from under the car it cant be the roof cage or brush guard.

I did wire brush the rust on bottom of truck and spray rustoleum. Could that have caused this groaning sound from 45-65mph? it did start happening right after this.