engine/trans noise

[mikey531]

This truck has a 6.0 engine with 56000 miles. When idling it makes a metallic tapping sound almost like a bolt hitting a shield. Sometimes the noise stops and other times it gets louder. I just recently serviced it and the noise is still there. If I rev it up just a bit it goes away. I have checked and wiggled every shield under the truck and it seems to be coming from the bell housing area. What have I missed?
Thanks
Mike

[maxwedge]

Loose convertor bolts? Cat internally seperated?

[corning_d3]

I'm thinking converter also..

[mikey531]

I was hoping for something easier and simpler.... oh well

Thank you

Mike

[bamadam]

I'm having the same problem.

Sounds like rattling metal?? Mine seems to be a harmonic of some kind when the engine hits a certain rpm level while in gear.
Wondered if it was a vibrating brake line or something.

Just had trans completely rebuilt and it had no effect on the noise at all.

[95Z71]

If its an automatic check the torque conveter bolts that connect to the flex plate (flywheel). I had one back out once a long time ago and it was an eazy fix. I dropped the lower bell housing cover and had a freind turn the motor with a socket and breaker bar to get each one. 15 min job. A long shot but its woth a look if you can't find anything else.

[bamadam]

Originally Posted by 95Z71

If its an automatic check the torque conveter bolts that connect to the flex plate (flywheel). I had one back out once a long time ago and it was an eazy fix. I dropped the lower bell housing cover and had a freind turn the motor with a socket and breaker bar to get each one. 15 min job. A long shot but its woth a look if you can't find anything else.

I thought so too and would still if I had not had to have the tranny completely rebuilt a month or so ago with no change whatsoever. opcorn:

[flair666369]

If the sound is more like a tapping than a rattling, I had a similar noise from my '98, sounded like a lifter tap, seemed that way because it would get faster with the rpm. After days of crawling/listening around my engine compartment and re-adjusting my rocker arms, turned out to be a small exhaust leak, that i couldn't feel. Weird how the way something sounds can lead you in the completely opposite direction. The sound went away after i torqued all the exhaust bolts down, it's worth a try. Hope this helps.