I've had some small grinding or popping noises lately when I leave a stop light and start to accelerate normally. Now it has become a constant sound when pulling up to a stop light and sitting there but doesn't happen all the time.

This morning I had the chance to pull over when it was happening and try to pinpoint it a bit better. While in park I can't really hear but maybe a single pop sound every minutre or so and I can't see or hear anywhere in the engine bay. However if I put the truck in drive with the emergency brake set I can start to hear the pop. Turn the wheel to the left and it gets even worse.

From inside the truck I can somewhat feel the pop in the floorboard under my feet and outside the truck I can hear it directly under the cab and to the rear of the truck.

Any ideas what it might be? If I am in drive but the wheels aren't turning the only thing rotating is the engine, torque convertor, and maybe the trans pump? Anything else?

This is a AWD truck with the 6L80 and maybe somewhere around 550 or 600 hp at the crank. Just trying to get a better idea on what it could be in order to pick the shop I drop it off at.

 

Maybe a cracked flexplate? Are you still running the stock one?

Chris

 

Yes, everything in the drivetrain is stock.

 

We have seen the OE flexplates crack at stock power levels, not super common though. But with a Whipple, you are past stock power.

Chris

 

Does the new Circle D flex plate fit the L92 and 6L80?

 

Yes it does.... It will fit any LS setup. no matter what transmission you have.

Chris

 

I think Chris is definitely onto something. I remember a thread where a guy though he had something very wrong because it sounded like it was coming from the bottom end of the motor, this is exactly what it ended up being.

 

does it sound like its poping mainly when u acc? if so then i would guess its the chain on the tcase skipping...atleast thats what mine was and sounded like on my blower truck when i scretch the chain