2007 GMC Yukon Denali AWD 6.2L Ticking Noise when accelerating

[Trademark505]

My 2007 Yukon DENALI AWD is making a clicking/ticking noise only when I accelerate past 30 mph and slightly goes away when speed is 60 mph or higher. Engine runs good and makes no noise while idling. The transmission was rebuilt in 2020. I just replaced the axles, wheels hub with bearings, motor mounts, fixed exhaust manifold and changed the transfer case fluid. The noise sounds like some playing cards flapping in bicycle wheel spokes. Any ideas what could be the issue?

 

[petethepug]

Exhaust manifold gasket is common.

Uncommon, but mean is a prankster attaching a jumbo zip tie on to one of your axles so you get that playing card effect.

 

[gooffeyguy]

Also common is broken exhaust manifold bolt/s causing an exhaust leak under acceleration sounds like ticking

 

[jeremiahm]

@Trademark505 did you ever figure this out? I have the same exact sound. Replaced u-joints (needed) and CV’s (torn boot) recently and SKF bearings have about 40k on them. Put a stethoscope on the hubs when axles were out and sounded clean, no clicks or grind. Noise just became noticeable in the last couple of thousand miles. No engine performance issues. I tightened and listened with a pipe at every exhaust manifold bolt, no ticks. Sounds like it is coming from front center of truck. Thanks.

 

[Fless]

@Trademark505 did you ever figure this out? I have the same exact sound. Replaced u-joints (needed) and CV’s (torn boot) recently and SKF bearings have about 40k on them. Put a stethoscope on the hubs when axles were out and sounded clean, no clicks or grind. Noise just became noticeable in the last couple of thousand miles. No engine performance issues. I tightened and listened with a pipe at every exhaust manifold bolt, no ticks. Sounds like it is coming from front center of truck. Thanks.

The OP hasn't been on here since last June.

 

[donjetman]

@jeremiahm
exhaust manifold leak.
Can only be doplicated under a load.

 

[jeremiahm]

The ticking sound, is like a baseball card in a bike wheel, and is not consistent with engine RPM. Exhaust leak would be consistent with engine RPM and this ticking sound is consistent with vehicle speed. Discovered today one of my rear wheel bearings is bad, don’t think that’s where this sound is coming from, but we all know how sound travels on a vehicle!

I know the OP hadn’t been on for a while, but thought I would give it a try.

Any other ideas?

 

[rdezs]

Your theory about an exhaust leak is consistent with RPM is a little bit flawed. Actually, it would be more consistent with the volume flowing through the exhaust. 1200 RPM with a pedal to the floor with leak more than 2000 RPM cruising at light throttle.

However, consistent with the vehicle speed regardless of accelerating or decelerating does sound like an axle or hub bearing. Good place to start. And yeah, from inside the cabin it will never sound like the corner of the vehicle it's originating from. Pull the axle, replace the bearing and the seal before doing anything else.... Most likely it's the source. And do the other side at the same time. It can't be far behind the one that's gone bad