Nasty grinding noise, what to look for?

bigdirty · Feb 12, 2012

I get nasty grinding noises when i left my foot off the gas and at cruising speed, it will not happen when you accelerate. Its pretty hard to explain using words, almost like a gurgling miss is my best description. Its also pretty loud (you can hear it over the radio) I thought it was my turbo(shaft play and hard to turn)... so now i have a 05 turbo, the noise continued.

Truck starts right up and builds oil pressure quickly so that rules out the STC fitting i guess? It also vibrates more than it used to

So my question is what should i look for, what can i check ?

faster6.0 · Feb 12, 2012

Video, is it throwing any codes?

Nasty7.3 · Feb 12, 2012

Torque convertor

HOOV3R · Feb 12, 2012

Broken flexplate maybe. Buddy of mine had a similar issue and found his flexplate was broken round all of the bolts to the crank.

Sent from my DROIDX using Tapatalk

bigdirty · Feb 12, 2012

No codes... here is a video kind of hard to hear

bigdirty · Feb 13, 2012

Nasty7.3 said:
Torque convertor

Its a manual

wetnsloppy4x · Feb 13, 2012

This is a long shot but its possible your throw out bearing is riding the pressure plate. Maybe its squealing when it decelerates?

Its also possible that you have a "teakettle" boost or drive pressure leak. Take a look around the firewall and see if you can find any soot coming from the up pipes. You might have a blown bellow.

bigdirty · Feb 14, 2012

wetnsloppy4x said:
This is a long shot but its possible your throw out bearing is riding the pressure plate. Maybe its squealing when it decelerates?

Its also possible that you have a "teakettle" boost or drive pressure leak. Take a look around the firewall and see if you can find any soot coming from the up pipes. You might have a blown bellow.

Bump

No boost leak or soot on firewall.

Still looking for opinions on this...

mike61 · Feb 14, 2012

check u-joints and rear end ? does it do it sittin still or drivin?

ckyguy68 · Feb 14, 2012

Could be your exhaust hitting your spinning driveshaft when you let off the throttle and everything torques in the opposite direction. Happened on my truck. I would definately look at it.