Go Back   F150online Forums > Powertrain & Mechanical > V8 Engines
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 12-09-2005, 05:15 PM
Member
 
Join Date: Oct 2004
Location: Oregon
Vehicle: 1997 Ford F150
Posts: 59
Send a message via AIM to My974x4F150
Humming Sound

Recently I've noticed a dull hum coming from the tranny? or rear end? It almost sounds like the new tire hum, or it being stuck in four high. Tires have 8 thoushand miles on them, and I don't think it is stuck in four wheel drive. It does it at all speeds. The pitch seems to get higher the faster I go. When driving on the highway at 65, if I put it in neutral, the sound isn't as loud, but as soon as I put it in gear and give it gas it becomes loud again. New tranny fluid 300 miles ago and new rear differental fluid 3000 miles ago. Any Ideas?
__________________
~~~~~~~~~~~~~~~~~~~~~~~~
97 F150 Lariat 4x4
Tritan 4.6, Auto, 132K
White Super Cab
70s Flowmaster
K&N Filter w/modified air box
265 70R 17's Open Country
Pioneer DEH-7600 (sweet)
4 - 3way 220w Pioneer 5 x 7's
Reply With Quote
  #2  
Old 12-09-2005, 07:06 PM
Senior Member
 
Join Date: May 2005
Location: Arizona
Vehicle: 1995 Ford F150
Posts: 198
When you changed the fluid, did you make sure to use the proper weight of synthetic oil? Also, have you checked the level recently? I know they don't put gaskets on some of the rear ends, and use silicone-- but if you don't let it cure enough, it will leak.

I'm thinking either rear end or wheel bearing, if it makes noise both in neutral and in gear.
Reply With Quote
  #3  
Old 12-10-2005, 10:31 AM
Member
 
Join Date: Oct 2004
Location: Oregon
Vehicle: 1997 Ford F150
Posts: 59
Send a message via AIM to My974x4F150
Thanks Clifford. I used Royal Purple, I forget what weight, it was what was recommended on this site and what Ford says to use... but this only started about 500 miles ago.
__________________
~~~~~~~~~~~~~~~~~~~~~~~~
97 F150 Lariat 4x4
Tritan 4.6, Auto, 132K
White Super Cab
70s Flowmaster
K&N Filter w/modified air box
265 70R 17's Open Country
Pioneer DEH-7600 (sweet)
4 - 3way 220w Pioneer 5 x 7's
Reply With Quote
  #4  
Old 12-10-2005, 11:30 AM
Junior Member
 
Join Date: Oct 2004
Location: out on the prairie
Vehicle: 1996 Ford F150
Posts: 8
Good morning-

Naturally, I don't claim to be a diagnostic guru, but my experience this fall showed me the humming can be a wheel bearing. The speed related humming worsened gradually at first. Then seemed to get worse by the week.

At the end i had the passenger side 4x4 hub assembly replaced. The resulting quiet was eerie at first.

respectfully,

dollartree_1
Reply With Quote
  #5  
Old 12-10-2005, 12:40 PM
Member
 
Join Date: Oct 2004
Location: Oregon
Vehicle: 1997 Ford F150
Posts: 59
Send a message via AIM to My974x4F150
How much to wheel bearings cost to replace? How involved is it to do it yourself.....?
__________________
~~~~~~~~~~~~~~~~~~~~~~~~
97 F150 Lariat 4x4
Tritan 4.6, Auto, 132K
White Super Cab
70s Flowmaster
K&N Filter w/modified air box
265 70R 17's Open Country
Pioneer DEH-7600 (sweet)
4 - 3way 220w Pioneer 5 x 7's
Reply With Quote
  #6  
Old 12-15-2005, 02:50 PM
Senior Member
 
Join Date: Jul 2005
Vehicle: 2010 Ford F150
Posts: 183
You may be able to hear the front bearings while turning. They usually change pitch, or loudness when turning one way vs the other. Also, you may be able to feel the looseness/slop when the wheel is jacked up off the ground, and you rock the wheel back and forth. Turning it may also reveal some noise.

The bearings are not serviceable. You have to buy the hub/bearing assembly as a unit. I think I paid around $200-$270 at my Ford dealer. I don't recall the exact price. Not too hard to R&R. You will need a 36mm socket for the axle nut.

Hopefully, your rotors aren't frozen on to the hub. If they are, you will need a gas torch to heat it up. Heat only around the hub, not on the rotor surface. If you don't have heat, you'll likely have to break the rotor. Get a big hammer, like a 3 lb'er, and hit the outside of the rotor surface. HARD. A couple or 3 big hits should break the rotor along the top of the hat area. Don't even waste your time trying to tap the rotor loose form behind. If it's loose, you'll know it. If not, you'll be also investing in a new rotor.

Good luck.
Reply With Quote
  #7  
Old 07-07-2010, 02:49 AM
Junior Member
 
Join Date: Jan 2002
Location: wisconsin
Vehicle: 2000 ford f-150
Posts: 7
Check the rear end my truck did the ame thing and I ended up replacing the pinion and carrier bearings $225.00 at NAPPA as for the rotors there junk,made in Mexico, replace them with the good ones made in the good old USA did that over the weekend along with the front wheel bearings $167.00 at the same store..........
Have Fun..............
Reply With Quote
  #8  
Old 07-07-2010, 03:32 AM
glc glc is offline
Senior Member
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 28,822
This thread is almost 5 years old - I doubt your comment will do the original poster any good.
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
Old 07-07-2010, 03:32 AM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 06:04 AM.





This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
 
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details