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<blockquote data-quote="Angus" data-source="post: 214002" data-attributes="member: 3057"><p>FYI: The 4.10's (or any other numerically higher gear) does not actually CAUSE the vibe - it simply AMPLIFIES any unpleasant harmonics that are already present. The higher gear (numerically) you go, the worse any inherent "vibe" will get. MOST '99+ Cobras will get increased "vibe" with a higher gear - that's why the '01's came with the IRS damper from the factory.</p><p></p><p>With that said, I did get some increased "vibe" when I had the 4.10's installed - it was probably already present, but the 4.10's made it worse. (Some folks even feel the "vibe" with the stocks 3.27's by the way) It's only noticeable above 70 mph though.</p><p>There <strong>ARE</strong> ways to make the vibe less intrusive - like re-indexing the driveshaft - but I have yet to try any of these fixes (yet).</p><p></p><p>You do have to shift a little more often, but after a few times taking the car out, you'll never remember the difference. The only difference you'll notice is how much more <strong>FUN</strong> your Cobra is - the 4V motors should have come with 3.73's or 3.90's from the factory!!!</p><p></p><p>I do not have an aluminum driveshaft, but will be getting one when other mods are done. I see a T56 in my future, which takes a different driveshaft than the 3650. So I'm holding-off for now.</p><p></p><p>The IRS differential - or "Pumkpin" does not need to be replaced for a gear change. The shop you take it to MUST have an IRS case spreader to properly change your gears though - the IRS pumpkin case can be damaged if one is not used.</p><p></p><p>Normal driving and cruising is <strong>AWESOME!!!</strong> Like I stated above, the 4V Cobras should have come with a higher gear to begin-with. The Cobra is a completely different animal with a 4.10 or 4.30 gear.</p><p></p><p>My car does "drone" a little (not enough to bother me really & it's only present at a steady 2000 RPM), but that is exhaust noise, which has little to do with the 4.10's. When I had the 4.10's & the stock cat-back exhaust, I had ZERO drone. You may be thinking of gear "whine", which is due to improper installation of the gears. If you have an experienced mechanic do the swap, there should be ZERO extra noise heard.</p><p></p><p>I LOVE my 4.10's, and would recommend them to anyone who is NOT going to get a blower or nitrous in the future. If you plan to add either one, the 3.73's might be a better choice due to (lack-of) traction issues. You may even want to install 4.30's if you are going to stay NA (Naturally-Aspirated).</p><p></p><p>Hope this info helps!</p><p></p><p>:thumbsup:</p></blockquote><p></p>
[QUOTE="Angus, post: 214002, member: 3057"] FYI: The 4.10's (or any other numerically higher gear) does not actually CAUSE the vibe - it simply AMPLIFIES any unpleasant harmonics that are already present. The higher gear (numerically) you go, the worse any inherent "vibe" will get. MOST '99+ Cobras will get increased "vibe" with a higher gear - that's why the '01's came with the IRS damper from the factory. With that said, I did get some increased "vibe" when I had the 4.10's installed - it was probably already present, but the 4.10's made it worse. (Some folks even feel the "vibe" with the stocks 3.27's by the way) It's only noticeable above 70 mph though. There [b]ARE[/b] ways to make the vibe less intrusive - like re-indexing the driveshaft - but I have yet to try any of these fixes (yet). You do have to shift a little more often, but after a few times taking the car out, you'll never remember the difference. The only difference you'll notice is how much more [b]FUN[/b] your Cobra is - the 4V motors should have come with 3.73's or 3.90's from the factory!!! I do not have an aluminum driveshaft, but will be getting one when other mods are done. I see a T56 in my future, which takes a different driveshaft than the 3650. So I'm holding-off for now. The IRS differential - or "Pumkpin" does not need to be replaced for a gear change. The shop you take it to MUST have an IRS case spreader to properly change your gears though - the IRS pumpkin case can be damaged if one is not used. Normal driving and cruising is [b]AWESOME!!![/b] Like I stated above, the 4V Cobras should have come with a higher gear to begin-with. The Cobra is a completely different animal with a 4.10 or 4.30 gear. My car does "drone" a little (not enough to bother me really & it's only present at a steady 2000 RPM), but that is exhaust noise, which has little to do with the 4.10's. When I had the 4.10's & the stock cat-back exhaust, I had ZERO drone. You may be thinking of gear "whine", which is due to improper installation of the gears. If you have an experienced mechanic do the swap, there should be ZERO extra noise heard. I LOVE my 4.10's, and would recommend them to anyone who is NOT going to get a blower or nitrous in the future. If you plan to add either one, the 3.73's might be a better choice due to (lack-of) traction issues. You may even want to install 4.30's if you are going to stay NA (Naturally-Aspirated). Hope this info helps! :thumbsup: [/QUOTE]
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