I have been hearing a metal whine like a merry-go-round when it is slowing down and I am thinking that my turbo may be going south.

 

Anyone? Bueller, Bueller, Bueller...

 

Is this noise heard under load or after revving while parked?

Mine is noticeable if I rev it in park, you can hear in wind down to the floe of the exhaust in idle.

Is it a consisitent sound or does it vary when you hear it, like the freezing up of and rolling of bearings?

 

Where in California are you? I would love to check out your truck.

 

Do a quick check on it. Pull the air filter off of it and grab the shaft and make sure it spins freely. Check the play in it, it should have some play side to side, but no end play. Make sure the turbine wheels aren't rubbing the housing at anytime. That will tell you a lot.

 

My first Turbo sounded like that, cause they put the oil check valve on backwards and i cooked it!

 

I can hear it with the windows up more because other noises do not distract. It does it when I am close to zero vacuum(no boost) then let off of the gas. I can hear the turbo slowing down then all of a sudden it starts to whine like metal on metal.

 

I am in Riverside county...If you are anywhere close I will take you for a ride. It is getting a reibuilt engine with all forged internalls and custom 8:1 compression pistons for more boost.

 

Did I read that right, a RCSB 2500? That's a different configuration now isn't it.

 

He's got an overseas model. It's a 1500 on a 2500 frame. So he's got 1500 lugged wheels but it's the frame/suspension and weight of a 1500 1/2.