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Car Forum / Dodge / Dodge Trucks / December 2008'01 whine in TC
with the arctic temps and snow we've been getting lately ive been forced to use four wheel drive to get around anywhere. recently i have been getting a whine when the front drive is engaged. it sounds like a power steering pump sounds when you crank it at -25 degrees, or one that is low on fluid and it sounds like the noise is coming from the transfer case. as engine rpm increases so does the noise. the front drive works, but with the noise i cannot use it so for now im forced to work out of my '08 ram (dont like working out of the new truck!). any ideas? thanks, Nathan In Montana http://ConcealedCarryForum.com http://InlineDiesel.com > with the arctic temps and snow we've been getting lately ive been forced > to use four wheel drive to get around anywhere. recently i have been [quoted text clipped - 10 lines] > http://ConcealedCarryForum.com > http://InlineDiesel.com Hey, Nate! Steve > Hey, Nate! hey steve, how are you sir?  SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com CV joint? > with the arctic temps and snow we've been getting lately ive been forced > to use four wheel drive to get around anywhere. recently i have been [quoted text clipped - 10 lines] > http://ConcealedCarryForum.com > http://InlineDiesel.com > CV joint? no, its coming from the transfer case. the noise gets higher pitched with engine speed even before road speed increases any. i assume based on this, that it has something to do with the fluid. anybody? SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com > no, its coming from the transfer case. the noise gets higher pitched with > engine speed even before road speed increases any. But nothing in the transfer case can spin up faster than the output shaft... try this: while holding a constant 50MPH or so, switch O/D on and off. Does the whine change any? > i assume based on this, that it has something to do with the fluid. Well, stupid question - but have you checked the fluid level? > have you checked the fluid level? not recently, but the fluid was changed just a couple months ago. my shop is packed with other projects so i cant get it in right now. when i go to diagnose it ill be laying in a literal foot of snow which is why i was hoping for some feedback here first to save me some time. perhaps ill take the video camera out later and record the noise. SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com >> CV joint? > [quoted text clipped - 3 lines] > > anybody? Well it isn't the T-case if the noise changes with engine speed and not road speed. There is no way for the T-Case to turn faster independent of the trans/engine. I would suspect it's trans related and has to do with the load on the trans. 4X4 puts a heavier load on the trans. SignatureSteve W. With the motor running and in neutral, let the truck roll very slowly. does the sound become any less obvious as it rolls? You may have the same issue with yours as I seem to be having with mine. But I tend to think it's the bearing on the input shaft of the tranny. Also, it will change pitch as engine speed increases and/or decreases. Signature------------------------------------------ Laszlo Almasi ----Cool Toys ----Mack Daddy Trailers ----Ice Angels > with the arctic temps and snow we've been getting lately ive been forced > to use four wheel drive to get around anywhere. recently i have been [quoted text clipped - 10 lines] > http://ConcealedCarryForum.com > http://InlineDiesel.com > With the motor running and in neutral, let the truck roll very slowly. > does the sound become any less obvious as it rolls? it doesnt make the noise at all until somewhere around 30 mph. SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com ok guys, ive uploaded a video of the noise in question. please disregard the high pitched squeeks near the end. that is interior vibration. the noise in question starts around 13 seconds and continues to get louder. somewhere around 22 seconds (while travelling around 30 mph) you will hear me press the accelerator hard so that you can hear the noise increase with the engine speed although road speed hasnt had time to change yet. since its a 1 mbps video hosted on a 1.3 mbps server i encourage you to download the video before attempting to view it. http://media.concealedcarryforum.com/tcnoise.wmv any ideas? thanks, SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com > ok guys, ive uploaded a video of the noise in question. please disregard > the high pitched squeeks near the end. that is interior vibration. the [quoted text clipped - 10 lines] > any ideas? > thanks, Sounds like a bearing whine. More so, as it seems torqe sensitive. Did whoever changed the fluids, put in the correct lube and did they put in the proper amount? Have you checked the fluid level yet? Roy > Sounds like a bearing whine. More so, as it seems torqe sensitive. Did > whoever changed the fluids, put in the correct lube and did they put in > the proper amount? Have you checked the fluid level yet? the ford dealership did the fluid change. i havent yet checked the level, i just stopped using front drive until the weather is a little better. thanks, SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com The front differential is still in motion. As there is not way to disengage it if it's still factory. And I agree....it sounds like a bearing to me as well. Since you seem to just hear it when 4wd is engaged, I'd suspect the transfer case. Signature------------------------------------------ Laszlo Almasi ----Cool Toys ----Mack Daddy Trailers ----Ice Angels >> Sounds like a bearing whine. More so, as it seems torqe sensitive. Did >> whoever changed the fluids, put in the correct lube and did they put in [quoted text clipped - 3 lines] > i just stopped using front drive until the weather is a little better. > thanks, > noise in question starts around 13 seconds and continues to get louder. > somewhere around 22 seconds (while travelling around 30 mph) you will hear > me press the accelerator hard so that you can hear the noise increase with > the engine speed although road speed hasnt had time to change yet. That almost sounds like howling from the front diff - especially around the 38-40sec mark (since this is an '01, you have a CAD, so the front diff is only under load when in 4WD - the rest of the time, it's freewheeling). If you can somehow get under the truck, just pop off the vacuum lines from the CAD, and see if you still get the same noise in 4WD. With the CAD disengaged (by lack of vacuum), the front diff won't be under load, so if the noise goes away, you've isolated it to the differential (and probably a worn pinion bearing). > That almost sounds like howling from the front diff what would cause that type of howling in the front diff? > the front diff is only under load when in 4WD - the rest of the time, it's > freewheeling). even when freewheeling arent the ring and pinion still turning? SignatureNathan In Montana http://ConcealedCarryForum.com http://1911talk.com http://HiPowerTalk.com http://GlockCarry.com http://P7talk.com http://PPStalk.com > what would cause that type of howling in the front diff? Misalignment of the ring and pinion gears due to a worn pinion bearing is the most likely cause. If the pinion nut backs off, that could cause the same symptom as a worn bearing. > even when freewheeling arent the ring and pinion still turning? It depends... what's offering less resistance? The ring gear turning the pinion, turning the front driveshaft, or the side/spider gears turning the intermediate axle shaft? And even if the pinion turns, it's not under load, so it wouldn't be subject to the same forces. Of course, the same holds true for the transfer case - without the front axle engaged, it's front output will turn, but won't be under any (significant) load, so that could also mask the issue - kind of invalidating the test I asked you to perform.... but what the heck, it's simple enough to do. Let's see what happens. >> noise in question starts around 13 seconds and continues to get louder. >> somewhere around 22 seconds (while travelling around 30 mph) you will [quoted text clipped - 11 lines] > the noise goes away, you've isolated it to the differential (and probably > a worn pinion bearing). Yup, I have the same noise or whine going on in the rear end of a car. Can't hear it at lower speeds but around 60mph it's there. It is definitely torque sensitive, no power no noise, add power and there it is. Under warranty and the dealer is ordering a new rear end. |
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