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The Terminator
Driveline
03 cobra clunk
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<blockquote data-quote="Sick SVT" data-source="post: 14171813" data-attributes="member: 106475"><p>yes you can get the clunk when shifting into first or shifting hard. When you shift and hit the next gear hard it can cause the rear subframe to flex or move a bit causing the noise. Mine did it the worst shifting into first at a stop but also did it under normal shifting as well. Read this from the ftbr website...and no you dont need to drop the irs to change the fluid</p><p></p><p><a href="http://fulltiltboogieracing.com/faqs.htm#clunk" target="_blank">http://fulltiltboogieracing.com/faqs.htm#clunk</a></p><p></p><p></p><p>Q: "Why do I hear a clunk in my drive train?"</p><p></p><p></p><p></p><p>A: There are a few reasons for this. Your transmission, differential and halfshafts can all combine for quite a bit of play, but that usually is not the MAIN source of the "clunk".</p><p></p><p> A few things can contribute to the Cobra "clunk".</p><p></p><p> #1 would be the rear differential support bushing. The rubber OEM differential bushings are designed to handle about 390 RWHP driven in a moderate fashion. </p><p>That eliminates about 98% of Cobra owners right there.</p><p></p><p> #2 would be front differential bushings whether they be OEM rubber or aftermarket poly. These need to be changed.</p><p></p><p> #3 would be the front subframe mounting bolts that can contribute to the "clunk". The 12mm bolts that were originally installed at the factory allow play when applying torque and decelerating.</p><p> This location is capable of accepting a larger bolt which will hold the front subframe mount more firmly in the chassis and prevent movement. See info above for our 9/16" bolt upgrade part number FT 1600.</p></blockquote><p></p>
[QUOTE="Sick SVT, post: 14171813, member: 106475"] yes you can get the clunk when shifting into first or shifting hard. When you shift and hit the next gear hard it can cause the rear subframe to flex or move a bit causing the noise. Mine did it the worst shifting into first at a stop but also did it under normal shifting as well. Read this from the ftbr website...and no you dont need to drop the irs to change the fluid [url]http://fulltiltboogieracing.com/faqs.htm#clunk[/url] Q: "Why do I hear a clunk in my drive train?" A: There are a few reasons for this. Your transmission, differential and halfshafts can all combine for quite a bit of play, but that usually is not the MAIN source of the "clunk". A few things can contribute to the Cobra "clunk". #1 would be the rear differential support bushing. The rubber OEM differential bushings are designed to handle about 390 RWHP driven in a moderate fashion. That eliminates about 98% of Cobra owners right there. #2 would be front differential bushings whether they be OEM rubber or aftermarket poly. These need to be changed. #3 would be the front subframe mounting bolts that can contribute to the "clunk". The 12mm bolts that were originally installed at the factory allow play when applying torque and decelerating. This location is capable of accepting a larger bolt which will hold the front subframe mount more firmly in the chassis and prevent movement. See info above for our 9/16" bolt upgrade part number FT 1600. [/QUOTE]
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03 cobra clunk
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