Welcome to Mustang Evolution.
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05-18-2007, 08:34 PM
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#1
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Help me diagnose this knocking
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I need bolts
Join Date: Oct 2004
City: Dallas PA
State: Pennsylvania
Posts: 3,513
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Alright ever since Ive had this car there has been a slight knock/clunk sound coming from underneath the car. It used to be quite faint, sporadically came and went.
Lately Ive been hearing it more. I have been really tough on my tranny and rear since I got these heads on so I am thinking it lies in the driveline. The only time I will hear it is when Im off the brakes decelerating.
The sound isnt constant, seems to get slower as the car slows. I think it's in the driveshaft, maybe moving around on the rear end side. Im going to try and get audio but does anyone have any ideas off the top of their head?
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05-18-2007, 11:21 PM
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#2
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Re: Help me diagnose this knocking
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No more obstacles
Join Date: Jul 2005
City: Marin County, Nor Cal
State: California
Posts: 893
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Do you notice any vibrations along with the clunk?
I would think if it were the ds you'd feel it as well.
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99 Cobra: flowmasters, 18x9.5 cobra R's, soon to be tuned and geared. daily driver
99 V6:in avatar, Mac Cai, true duals/flowmaster 40's ,UDP, custom tuned, bullitt suspension 18" wheels...taken by mother nature 
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05-21-2007, 01:04 PM
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#3
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Re: Help me diagnose this knocking
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No more obstacles
Join Date: Jul 2005
City: Marin County, Nor Cal
State: California
Posts: 893
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__________________
99 Cobra: flowmasters, 18x9.5 cobra R's, soon to be tuned and geared. daily driver
99 V6:in avatar, Mac Cai, true duals/flowmaster 40's ,UDP, custom tuned, bullitt suspension 18" wheels...taken by mother nature
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05-21-2007, 01:58 PM
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#4
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Re: Help me diagnose this knocking
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Registered User
Join Date: Feb 2005
City: Delray Beach
State: Florida
Posts: 339
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My dad had something similiar in his suv. Ended up being something really weird like a balljoint or something with the steering assembly, not for sure. I'll see if I can find out what it was that was acting up on his car.
~Jon~
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Sinister Six 1998 3.8L V6
Done So Far:
~CAI, True dual exhaust, UDPs, MGW Shifter, H&R springs, Stage 1 & 2 supension kit, performance rotors & pads, steel braided lines, 1 inch rear spacers, A.R. Rebel 17x9s with BFG rubber! 
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05-21-2007, 03:41 PM
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#5
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Re: Help me diagnose this knocking
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gawga girl
Join Date: Apr 2007
City: Eatonton
State: Georgia
Posts: 63
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my car is doing the same thing...except there is a little vibration or jolt with it..hard to explain..let me know if you find out whats wrong with it though. =)
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05-22-2007, 08:01 PM
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#6
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Re: Help me diagnose this knocking
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I need bolts
Join Date: Oct 2004
City: Dallas PA
State: Pennsylvania
Posts: 3,513
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Im going out right now and getting a video of it.
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05-23-2007, 06:36 PM
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#7
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Re: Help me diagnose this knocking
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I need bolts
Join Date: Oct 2004
City: Dallas PA
State: Pennsylvania
Posts: 3,513
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K, I have vids in my gallery here... http://www.mustangevolution.com/gall...ry.php?cat=613
After really paying attention to it I am starting to get a little scared that it is the bottom end on its way out. I havent exactly been babying this car, its been to redline a lot...
Best vids of it are knock 4 and knock 5.
Dont pay attention to my lifter tick that goes away eventually.
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05-25-2007, 11:41 PM
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#8
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Re: Help me diagnose this knocking
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Registered User
Join Date: May 2007
City: Avondale
State: Colorado
Posts: 73
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I had the same prob with my 99 and come to find out it was my Spider Gears. Does it make the noise more so when you turn if so that could be it. Just through in a T-Lok to fix that prob, it worked for me..
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1999 Atlantic Blue Mustang Convertible V6 Auto - V-Force Mufflers w/ true Dual Exhaust setup, Dynotune Wet Nitrous Kit, B&M Tranny Cooler, B&M Shift Kit, BBK CAI, and T-Lok. 
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