Help diagnose a noise

[vlad588]

Every time and i step on the gas and especially when let go of it something loudly bangs underneath the car. I’ve check all the usual suspects (front drive shaft cv-joint, all u-joints are good, control arms in the back are new iron rock with flex joints, all ball joints seem good, engine and transmission mounts have been replaced a year ago with OEM) so i’m really running out of ideas what could be causing it. Any suggestions would be appreciated.

 

[LibertyTC]

Do you think it may be coming more from front or rear?
Possibly it is the sway bar end links?

 

[vlad588]

Do you think it may be coming more from front or rear?
Possibly it is the sway bar end links?

It sounds like from the rear, and i had the sway bar links replaced not to long ago. I’m starting to wonder if it could be the diff, i had detroit true trac put in it couple of years ago, and maybe the shop didn’t set the backlash correctly.

 

[vlad588]

I’m almost wondering if i should try removing the rear drive shaft and drive in front wheel drive mode to see if the noise goes away, and then do the same with front drive shaft.

 

[KJowner]

Rear A frame OK?

 

[Steelman]

Every time and i step on the gas and especially when let go of it something loudly bangs underneath the car. I’ve check all the usual suspects (front drive shaft cv-joint, all u-joints are good, control arms in the back are new iron rock with flex joints, all ball joints seem good, engine and transmission mounts have been replaced a year ago with OEM) so i’m really running out of ideas what could be causing it. Any suggestions would be appreciated.

Gee- when you let off? Backfire?

 

[Damotm]

Front diff bearing?

 

[Kawika]

I had a problem with the motor mounts being loose and making a clunk sound that I swear was everything but..
I was wrong until I was right.

 

[vlad588]

Okay i think i figured it out. Took it to a mechanic and he couldn’t figure it out, said everything is tight and looks good. So i bought myself chassis ears and listened to every bit of rear suspension. Turned out its the flex joint on the upper A-arm . It feel tight, i can’t move it with a breaker bar but i got a half a turn on the nut, and that did it.

 

[Kawika]

Okay i think i figured it out. Took it to a mechanic and he couldn’t figure it out, said everything is tight and looks good. So i bought myself chassis ears and listened to every bit of rear suspension. Turned out its the flex joint on the upper A-arm . It feel tight, i can’t move it with a breaker bar but i got a half a turn on the nut, and that did it.

Good job