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  • Need Help with loud thump coming from my car!

    I don't know if this is the right forum to be in for this question. I am putting it here because I think it has to do something with my suspension. My problem is that when I go hard on the gas and I shift, I get a real hard thump from my rear end. Kind of like some hammer is hitting from underneath. It happens from 1st thru 3rd when I shift hard. I am guessing that since I am lowered, my axle is hitting the bump stops. Does anyone else's car do this same thing? Or does any one know what it could be? Thanks for the replys.
    Carlos<br />1999 White Pontiac Firebird 3.8<br />Mods: Yes, I got some, but not enough.<p>CFFB# 90<p>1/4: 14.93<br />MPH: 92.44<p>My car:<br /><a href=\"http://www.99birdv6.cz28.com\" target=\"_blank\">www.99birdv6.cz28.com</a><p>\"Real men drive 5-speeds.\"

  • #2
    I have gotten that once in mine and once in my mom's 01 SS when I was romping on hers. I wonder if it's wheel hop?
    2002 Camaro SS 6 Spd<br />Sebring Silver Metallic<br />Still breaking it in<p>Traded in - 2002 V6 5 Spd Camaro.<p>\"I\'ll never trust squirrels again.\"

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    • #3
      Re: Need Help with loud thump coming from my car!

      mine does the same thing. thought it was wheel hop at first but im pretty sure the tires arnt breaking traction? im at a loss , but it sounds pretty violent and seems to be getting worse/ more frequent even when under moderate throttle.

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      • #4
        Re: Need Help with loud thump coming from my car!

        Epic grave dig I must say. Simply Epic.

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        • #5
          Re: Need Help with loud thump coming from my car!

          Could be your trans mount is bad or check the TQ arm mount. But by now since it is about 9 years later their probably fell off by now.LOL
          08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
          96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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          • #6
            Re: Need Help with loud thump coming from my car!

            check your u joints as well.
            69 Camaro 350 4spd, Full Hotchkis susp, Baer brakes, moser 12 bolt, Flowmaster<br /><br />96 RS Hotchkis STB, subframe connectors, Hotchkis LCA and adj Panhard rod, SS camaro sway bars, Bilstein shocks, powerslot rotors, Borla exhaust, rksport headers, k@nFIPK

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            • #7
              Re: Need Help with loud thump coming from my car!

              my guess is a bad trans mount.

              most of the time wheel hop isnt just one bang, its like 5 bangs in ~1.5 seconds, kinda like a jack hammer

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              • #8
                Re: Need Help with loud thump coming from my car!

                i had the same thing and it was a trans mount deffintaly cheak that... im on my 3rd one now.

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                • #9
                  Re: Need Help with loud thump coming from my car!

                  is the shifter bouncing?

                  Abbott long tubes,homemade true duals,slp ram air,whisper lid,eibach springs,kyb shocks,BMR subframe connectors, BMR LCA reloc brackets,BMR LCAs. T-top/manual converted

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                  • #10
                    Re: Need Help with loud thump coming from my car!

                    Mine was making a noise like that and I kept thinking it was the u joints but ended up being the RCA bushings.

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                    • #11
                      Re: Need Help with loud thump coming from my car!

                      I had it, now that I think of it. I also had a bad transmission mount. Check that first, then see if you have any missing fasteners and loose parts.

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                      • #12
                        Re: Need Help with loud thump coming from my car!

                        also check to see if the exhaust is banging on the driveshaft tunnel brace

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                        • #13
                          Re: Need Help with loud thump coming from my car!

                          thanks for all the feed back. ill check these points and get back to you guys, hopefully saying that its fixed.:poke:

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                          • #14
                            Re: Need Help with loud thump coming from my car!

                            so i got under there and look around, everything looked normal. so i removed the trans mount. sure enough. it was broken. replaced it . and no more thump
                            :D

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