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weird vibration/humming when in gear?
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[QUOTE]Originally posted by SydeWaySix: [QB] [QUOTE]Originally posted by Luke87GT: [qb] Ian, few questions: 1.) Does it do it at a specific RPM window or at a specific speed? Does it only occur in 5th gear? Can you reproduce it in 4th? 2.) The on-off-on-off sequence... what frequency would you estimate? About 1 Hertz? 3.) I assume you can feel it in the shifter? 4.) You mentioned that as you speed up the sound gets a little louder. Does it go away after you pass a certain RPM or speed? The reason I ask these questions is because I have very similar symptom in my 96 Cobra. It's an extremely subtle thing, so I never paid too much attention to it nor have I ever been able to narrow it down. I've never even had any passenger notice it before. Here is what mine does: The humming that you are describing has about 1 second between hums: hum -> 1sec pause -> hum -> 1 sec pause -> hum (just like you described on, off, on, off, etc). - It only happens in 5th gear (never does it in any other gear - I tried to reproduce it many times in 4th but cannot). - It only happens between 2100-2500RPM. Outside of this window it never does it. - It only happens when I am on the throttle in the 400 RPM window described above. If I am off the throttle, I never hear any humming. - If I am parked and rev the engine between 2100-2500RPM, I don't hear anything... it's silky smooth. Since it does not do it when I rev the engine in neutral, I don't think it has anything to do with engine harmonics. Since it only does it in 5th gear at a specific RPM window, it's not the wheel balance. I also find it hard to believe that it is rearend related. If it were rear-end related, I would expect to feel it in 4th gear too (if I matched the vehicle speed where I normally feel it in 5th gear). It's possible that it is related to the rear, but i am not 100% convinced. Now I notice that we both have 4.30 gears and aluminum shafts. Wonder if that may have something to do with it? I'm also curious if you have your "dogbone" removed from the underside of the pumpkin? Might be worth bolting that back on and giving it a whirl. Mine's long gone too. It's puzzling, and I have just ignored it for the past year, lol. Maybe we could post this on corral or svtperformance and see what people say? [/qb][/QUOTE]Luke, sounds like we have the same issue. My cousin was in the car today and culdn't hear it until I pointed it out to him. Like you, I can only hear it in 5th gear. I tried 4th gear and I couldnt hear anything. The only difference is that I can hear it in any RPM range, not just 2100-2500 like you. I'm not sure if I have the dogbone or not, but if you can describe what that part is then I can check. I posted this on svtp so hopefully we can get more input on it there. [/QB][/QUOTE]
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