Thread: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard...

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  1. #1 Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    Yesterday I was out driving around out in the middle of nowhere. I got to a stop sign and I got on it spinning tires to 2nd gear... well when it shifted into second gear it not only scratched gears or chirped into 2nd (which is normal) but it made a clunk sound, felt like it hit under my floorboard. When applying the brakes (rather heavly) I heard the clunk again. I thought something let go or I hit something. After testing out shifting into second gear and heavy braking a few more times, I realized there is a problem somewhere. It feels like its coming somewhere in the front of the vehicle on the drivers side.

    Today I put the car on jack stands, put the car in gear (D) with the foot on the brake, foot on the gas and building RPMs the car would make the clunk, when putting it in R and doing the same test, it would make the clunk again.

    I checked the A arm bushings and they look fine, there not the original but they do have probably 100,000 miles on them since I last replaced them. No noticeable cracks or shifting though, they look really good. I checked the subframe bolts, all felt damn tight. The motor and tranny mount visually look normal. So does the ball joints and tie rod ends. I even check for play in the wheels, all felt good. Strut mounts look fine too, as well as the torque struts and bushings (which are poly anyway). Actully while testing today I ended up breaking that drivers side bracket on the engine (the cheap pot metal one). I'll have to pick one up at the junkyard hopefully tomorrow. I undid the torque struts and moved the engine and tranny by hand back and forth, I could't simulate the noise.

    I should also mention, I had my wife get in the car and perform the testing above while I inspected all around and under the car. I have NAPA Solid Motor and Tranny mounts on the bottom end. It seems like both of the mounts had quite a bit of back and forth movement when torquing the motor, more so than what I would of thought being solid rubber, especially the tranny mount (and yes, I did make sure they were solid when installing them). I'm kinda wondering if my tranny mount is just shot already, but its hard to believe with only 7,000 miles on them. The A Arms seemed to deflect alot too, but I think most of that is normal seeing how there rubber bushings.

    This is a long shot, but anyone ever have this kinda issue? What did you find out? I think I checked all the right areas honestly. I'm kinda baffled on this one. I figured it would be something easy to figure out, guess not knowing my luck. I figure i'm solo on this but i'm really hoping someone maybe able to point me in the right direction. Thanks!
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  2. #2 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
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    did you torque the front control arm bushing bolts nice and good? had this same issue and turned out to be that, when i hit the gas, braked, or went over a bump.
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  3. #3 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    Bolts are plenty tight, I just checked them again. Anyone else?
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  4. #4 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    The Blue One blueguy's Avatar
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    Replied on KCPMC Shawn
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  5. #5 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    TTTT
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  6. #6 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GrandPrix Junkie Sabrewings's Avatar
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    Check the tightness of the diagonal braces. I had a similar popping and it ended up being the bolts on the driver side brace being a bit more loose than the ones on the passenger side.
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  7. #7 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    Quote Originally Posted by Sabrewings View Post
    Check the tightness of the diagonal braces. I had a similar popping and it ended up being the bolts on the driver side brace being a bit more loose than the ones on the passenger side.

    Good suggestion and I know exactly what you're talking about, unfortuneitly my issue is a bit different than this. This is a pretty defined noise and you feel it in the floor board....
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  8. #8 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    Dumb question, being a FWD car anyone have or think a ball joint could do this type of noise? Throughts?
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  9. #9 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
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    could be, especially at high mileage
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  10. #10 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GTX Level Member DanGTP's Avatar
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    I sure hope you get this figured out! I am having the exact same issue, except mine seems to be coming from the passenger side. I went through and tightened the control arm bolts just to be sure and the noise went away, but only temporarily. Now, no amount of torquing on any of the bolts I can get to has stopped the noise. My ball joints are good - at least they passed the wobble test...
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  11. #11 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    Hummmmm Dan, I donno. I still haven't figured it out. I'll look at it again this weekend.

    Tell me Dan, how are your lower motor and tranny mounts?

    I'm gonna recheck my control arm bolts i think.........
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  12. #12 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GTX Level Member DanGTP's Avatar
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    Both mounts have less than 10k on them. They are the solid options from Auto Zone.
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  13. #13 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
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    are the control arm bushings in good condition?
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  14. #14 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GTX Level Member DanGTP's Avatar
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    Mine are the originals (120k) That's probably the issue for me.
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  15. #15 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    My control arm bushing were replaced once... 100k ago but I checked mine out, they look good, no cracks or anything. Don't know how much movement is acceptable though.......
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  16. #16 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GTX Level Member DanGTP's Avatar
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    Mine are crack-free, too, but it looks like the rubber part is squished more on one side than the other.
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  17. #17 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    pics?
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  18. #18 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GTX Level Member DanGTP's Avatar
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    Quote Originally Posted by Iron Indian View Post
    pics?
    I'm doing some exhaust work on my car today, so I'll see if I can get a good picture of the bushings while I'm under it.
    ~
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  19. #19 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    I replaced my outer tie rods (since there free and lifetime Moogs) for the hell of it, that obviously didn't fix it so I still am lost on this one...
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  20. #20 Re: Odd issue... Pop/Clunking sound shifting into 2nd OR braking hard... 
    GXP Level Member Iron Indian's Avatar
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    TTT
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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