Trans?Driveline?U-joints?
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Senior User
Joined: Jul 2000
Posts: 162
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Trans?Driveline?U-joints?
I have a 98 F-150 4.6 2wd. My problem is that under
moderate to heavy acc.from a stop,a loud rurr rurr
rurr sound seems to be coming from the under hood
area. the engine rpms seem to follow this pattern
along with the noise,when it happens. this noise
usually starts when the rpms are nearing a shift
point. The truck has about 40 thousand miles on it
and has a K/N intake kit,B/M electric shift improver,and a non factory dual exhaust. The noise
almost sounds like the fan contacting the shroud,
but it is to low pitched to be this. Has anybody
else experienced this problem? Help! If you need
more info to answer, let me know.
moderate to heavy acc.from a stop,a loud rurr rurr
rurr sound seems to be coming from the under hood
area. the engine rpms seem to follow this pattern
along with the noise,when it happens. this noise
usually starts when the rpms are nearing a shift
point. The truck has about 40 thousand miles on it
and has a K/N intake kit,B/M electric shift improver,and a non factory dual exhaust. The noise
almost sounds like the fan contacting the shroud,
but it is to low pitched to be this. Has anybody
else experienced this problem? Help! If you need
more info to answer, let me know.
Post Fiend
Joined: Feb 2000
Posts: 11,496
Likes: 6
From: Kansas
Trans?Driveline?U-joints?
I assume you have a tach. If so will it do it in neutral at that speed? You say it sounds like a fan hitting a shroud - Have you checked the shroud and motor mounts? I assume your duals are from the cat converters on back. Is one of them flexing enough to vibrate against the body while the engine is torqued over? Do they have a crossover that would rub the body as the engine torques up? I doubt driveline or tranny.
New User
Joined: Mar 2001
Posts: 18
Likes: 0
Trans?Driveline?U-joints?
I have a '98 4.6l, 3.08, 4 spd auto and it too has a noise coming from the rear end (is what was determined). The Ford mechanic said the bearings in the rear end are going bad because of the synthetic fluid they put in. I get the noise around 35-45 mph then again over 70mph. When you let up on the gas you don't hear it, when you give it gas you do in the speeds mentioned. It's about a $525 job to fix it and the Ford mechanic said he would not put the same synthetic fluid back in.
George
bemeup@ccp.com
George
bemeup@ccp.com
Junior User
Joined: Feb 2001
Posts: 94
Likes: 0
Trans?Driveline?U-joints?
So,he is saying that the manufacturer is wrong by putting synthetic lube in the diff.!!?? You may want to get in contact
with Ford customer svc. at the 1-800 number.. I don't think he has the authority to make that descision,and it will void the part warranty if it fails again. That tech would've scared me away from the svc. dept of that dealer. check back with him and confront him with the facts.. Is he saying their at fault because they put the "wrong" weight of diff lube in,or are they saying that they are going to put non synthetic fluid
in because the factory fluid is bad for the differential?? If they put the wrong fluid in,make them pay for the repairs. They couldn't make me believe the mfgrs' specified lube is bad,that doesn't make any sense. I'll say it again,,the parts warranty(12mos./12000 miles) will be voided,if they put the dyno lube in it. If it fails again,you will be back where you started,with no recourse...If I am wrong about anything,either by lack of knowledge,or assumption,let me know. This just sounded like they were giving you a line of BS:-),,,,,98
(formerly 65fordmidsize)
My trouble turned out to be a loose a/c compressor(just lucky I guess)
with Ford customer svc. at the 1-800 number.. I don't think he has the authority to make that descision,and it will void the part warranty if it fails again. That tech would've scared me away from the svc. dept of that dealer. check back with him and confront him with the facts.. Is he saying their at fault because they put the "wrong" weight of diff lube in,or are they saying that they are going to put non synthetic fluid
in because the factory fluid is bad for the differential?? If they put the wrong fluid in,make them pay for the repairs. They couldn't make me believe the mfgrs' specified lube is bad,that doesn't make any sense. I'll say it again,,the parts warranty(12mos./12000 miles) will be voided,if they put the dyno lube in it. If it fails again,you will be back where you started,with no recourse...If I am wrong about anything,either by lack of knowledge,or assumption,let me know. This just sounded like they were giving you a line of BS:-),,,,,98
(formerly 65fordmidsize)
My trouble turned out to be a loose a/c compressor(just lucky I guess)
New User
Joined: Mar 2001
Posts: 18
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Trans?Driveline?U-joints?
Don't know what authority the mechanic to make the call that the synthetic fluid was in part causing the problem. In his estimate of the repair he was not going to put back the factory synthetic fluid but a different synthetic fluid instead. I took the truck to another person who is regarded as a rear end specialist and he determined, after a test drive, that the pinion bearing is bad. He however would not put in anything but the factory synthetic fluid. I'm taking the truck to another ford dealer today at noon for still another opinion. WHO DO YOU TRUST?
Thanks for the response.
George
bemeup@ccp.com
Thanks for the response.
George
bemeup@ccp.com
Junior User
Joined: Feb 2001
Posts: 94
Likes: 0
Trans?Driveline?U-joints?
That does sound a little wierd. Did they change the fluid,then the diff. failed? I'm a little confused on that point. I take it the the truck is out of warranty? If they put a lube in,then the diff. failed after the fact.they should be responsible for the repairs. (IMO)... If it failed with the original lube,and they don't want to use it when they reassemble it,that I could understand. $525 sounds like a decent price,as that is about the price I've seen quoted for doing a complete gear swap. Good luck on your dilemma,,,,,,,98
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New User
Joined: Mar 2001
Posts: 18
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Trans?Driveline?U-joints?
I bought the truck two weeks ago with the whine in the rear end (I took it for a test drive but apparently did not go over 70mph when the whine is heard). The previous owner swears no one ever put anything in the rear end. In all the times he had the truck serviced he claims he watched them do it and does not recall anyone putting anything into the differential. My friend who used to work as a Ford mechanic came over tonight and when I told him about the whine he said the carrier bearing is bad. In any case I have a high speed whine coming from the rear end on what I consider a truck that is barely broke in (51000 miles). He too said that while he was at Ford the whine was a big problem. Of course Ford is not going to admit it until they hear from a lot more of us. I plan on calling them Monday and also the NHTSA hot line.
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