05 Silverado clanking when accelerating over a certain speed and sometime breaking

[Chris Walls]

The other day on the highway if I went over 75mph I would hear a noise every now and then that sounded like driving over a reflector in the road. The following day is was more frequent and louder over 70mph. Every day it seems to drop 10mph. If I stay under 45 there is no noise but as soon as I hit 46 it’s an aggressive clanking noise. Any ideas

[diyer2]

Where does the sound come from?

Front differential?

Rear Differential?

Transfer case?

Transmission?

Engine?

Front wheel?

Rear wheel?

Help us and we might be able to help you.

 

 

[Chris Walls]

It’s not the engine or transmission. Think of the sound when you go over a reflector in the road and amplify it. My mechanic thought it was the drive shaft u joints from talking to him but after he heard it he wants to replace the rear end cause he “thinks it could be that.” I don’t want to shell out $600-$700 for could be that. Doesn’t make any noise till I’m going over 45 so I don’t know where it’s coming from but feels under the drives side seat