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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Help with grinding sound only in 4 wheel drive
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<blockquote data-quote="Coyote_695" data-source="post: 2023973" data-attributes="member: 71381"><p>I think it sounds like a bearing as well. I'm fairly certain that it is coming from in the front, and is only present in 4 wheel drive (4A, 4H). </p><p></p><p>Initially, I pulled the IWE vacuum to have the hubs engaged in 2wd so that the whole front end would be engaged which made no noise, so that more or less ruled out IWE or wheel bearings in my mind. Still only occurred when in 4wd. So something is happening when 4wd is engaged and there is some load on the system. But as mentioned, new t-case, front axles were inspected, new driveshaft, so I'm stumped. It doesn't sound normal, but at this point I'm inclined to just accept it until it becomes more obvious. </p><p></p><p>Really the only other thing I can think of would be the front diff pinion bearing since removing the drive shaft removed the noise. I would be a little surprised if the shop missed a worn pinion bearing (front or rear) after looking everything over so many times, but its certainly possible. Thing is, with the IWEs engaged in 2wd, that front diff pinion and drive shaft are still spinning, and making no noise until 4x4 is engaged.</p></blockquote><p></p>
[QUOTE="Coyote_695, post: 2023973, member: 71381"] I think it sounds like a bearing as well. I'm fairly certain that it is coming from in the front, and is only present in 4 wheel drive (4A, 4H). Initially, I pulled the IWE vacuum to have the hubs engaged in 2wd so that the whole front end would be engaged which made no noise, so that more or less ruled out IWE or wheel bearings in my mind. Still only occurred when in 4wd. So something is happening when 4wd is engaged and there is some load on the system. But as mentioned, new t-case, front axles were inspected, new driveshaft, so I'm stumped. It doesn't sound normal, but at this point I'm inclined to just accept it until it becomes more obvious. Really the only other thing I can think of would be the front diff pinion bearing since removing the drive shaft removed the noise. I would be a little surprised if the shop missed a worn pinion bearing (front or rear) after looking everything over so many times, but its certainly possible. Thing is, with the IWEs engaged in 2wd, that front diff pinion and drive shaft are still spinning, and making no noise until 4x4 is engaged. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Help with grinding sound only in 4 wheel drive
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