'01 whine in TC - VIDEO ADDED

From : nathan w collier

Q: 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 -- nathan in montana http//concealedcarryforum.com http//1911talk.com http//hipowertalk.com http//glockcarry.com http//p7talk.com http//ppstalk.com .

Replies:

From : royroy

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 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 -- nathan in montana http//concealedcarryforum.com http//1911talk.com http//hipowertalk.com http//glockcarry.com http//p7talk.com http//ppstalk.com .

From : nathan w collier

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 -- nathan in montana http//concealedcarryforum.com http//1911talk.com http//hipowertalk.com http//glockcarry.com http//p7talk.com http//ppstalk.com .

From : carolina watercraft works

the front differential is still in motion. as there is not way to disengage it if its 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 id suspect the transfer case. -- ------------------------------------------ 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 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 -- nathan in montana http//concealedcarryforum.com http//1911talk.com http//hipowertalk.com http//glockcarry.com http//p7talk.com http//ppstalk.com .

From : tom lawrence

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 its 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 wont be under load so if the noise goes away youve isolated it to the differential and probably a worn pinion bearing. .

From : nathan w collier

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 its freewheeling. even when freewheeling arent the ring and pinion still turning -- nathan in montana http//concealedcarryforum.com http//1911talk.com http//hipowertalk.com http//glockcarry.com http//p7talk.com http//ppstalk.com .

From : tom lawrence

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... whats 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 its not under load so it wouldnt be subject to the same forces. of course the same holds true for the transfer case - without the front axle engaged its front output will turn but wont 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 its simple enough to do. lets see what happens. .

From : roy

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 its 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 wont be under load so if the noise goes away youve 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. cant hear it at lower speeds but around 60mph its 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. .