howl noise

[yellar]

my 2004 fx4 5.4 has a howling noise when i reach 80 km/hr. if i speed up to 90 the howl goes away. it only seems to howl at 80?? any one have any ideas what could be causing the noise? i have only owned the truck for a few months. noise has been going on for a while now. truck is showing 80000 kms.

[AlbusPlaustrum06]

Originally Posted by yellar

my 2004 fx4 5.4 has a howling noise when i reach 80 km/hr. if i speed up to 90 the howl goes away. it only seems to howl at 80?? any one have any ideas what could be causing the noise? i have only owned the truck for a few months. noise has been going on for a while now. truck is showing 80000 kms.

Tires?

Differential(s)?

Full moon?

My 98 had bad tire noise at certain speeds unless it was raining. Improper inflation on my part. I had howl from my dif on my 94 at anything over 50kph until the thing died, dang speed sensor crap.

[BlueOvalFitter]

Originally Posted by yellar

my 2004 fx4 5.4 has a howling noise when i reach 80 km/hr. if i speed up to 90 the howl goes away. it only seems to howl at 80?? any one have any ideas what could be causing the noise? i have only owned the truck for a few months. noise has been going on for a while now. truck is showing 80000 kms.

A werewolf under your hood?
Seriously,I think there is a TSB on howling differentials that year.

[yellar]

if it is the diff does that mean something is wrong or is that just how they are for that year?

[Fishin76]

My read end howls on my 4x4 screw, has since i bought it with 66k miles

I've had no problems.

[yellar]

im not for sure but if it was my diff....wouldnt it be making noise at all speeds rather than just at 80 ?

[1saxman]

No. rears are very speed-related as far as the whine or howl is concerned. If it were a wheel bearing or tire, then it would make noise at all speeds. You might consider changing the oil in the rear and using the full-synthetic factory part to replace it.

[mswpj]

Probably the diff. Mine did the same thing. $1500 dollars later, it was fixed. If you have it looked at, and it needs to be repaired, push for FORD oem ring and pinion. I had two different aftermarket ones in my diff and they whined right from the start. rear end whined from 45-50mph accelerating only.

[ChargersFanInCO]

Ring and pinion too tight will make it howl at various speeds. Too much preload...Usually.

[yellar]

just had the truck in at alberta driveline. i went with the mechanic for a test drive, when he heard the noise he told me he thought it was the crown and pinion set. he also said it is caused from too heavy of a load either in box or from trailer. i asked if it was necessary to get fixed right away, and he said i could leave it for up to 3 years with no problems except for the noise. 1000 to fix

[slomafarms]

had the same prob on my 04...took it to the dealer and the compleatly rebulit the rearend under warranty...3 days later it started to howel again