Need help pinpointing this problem - JeepForum.com
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post #1 of 10 Old 08-17-2017, 04:10 PM Thread Starter
Gordknight412
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Need help pinpointing this problem

I have an 03 TJ, manual with 137k miles on it. Ive had the whole thing looked up and down. Recently did all fluids and sparkplugs etc. Engine runs superb. My issue though is when I am going any speed over 50 mph I start to hear like a whirring hum/whistle that gets higher in pitch and louder the faster I go. It isnt linked to RPM but is linked to speed and whether or not my foot is on the accelerator. If I take my foot off the accelerator the sound completely vanishes. The whine is loudest when in the first 1/4 of the accelerator pedal and gets a tad quieter the more gas I give it, but as long as my foot is on the accelerator the sound is there.

It is really hard to tell where it is coming from. My guess is the rear diff which is a DANA 44 at 3.73 gear ratio. Im getting more mechanically inclined but not enough nor do I have the tools to work on it myself.

Im taking it into a trusted mechanic on Monday, but I want to get as much knowledge as I can before I go in so unnecessary things dont get replaced or checked.

After researching I've narrowed it down to being a Rear diff problem (pinion), throw out bearing or the input shaft bearing.

Any thoughts? Thanks!

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post #2 of 10 Old 08-17-2017, 04:15 PM
BPPix
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Don't overlook something as simple as a squashed exhaust pipe.

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post #3 of 10 Old 08-17-2017, 04:22 PM
Jerry Bransford
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Quote:
Originally Posted by Gordknight412 View Post
...After researching I've narrowed it down to being a Rear diff problem (pinion), throw out bearing or the input shaft bearing.
I'd eliminate the throwout bearing as a possibility, its bearings only spin when you're stepping down on the clutch pedal.

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post #4 of 10 Old 08-17-2017, 05:01 PM Thread Starter
Gordknight412
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Quote:
Originally Posted by Jerry Bransford View Post
I'd eliminate the throwout bearing as a possibility, its bearings only spin when you're stepping down on the clutch pedal.
Thanks!
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post #5 of 10 Old 08-17-2017, 06:09 PM
aeroshots
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Any suspension mods done lately like lifts etc.?
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post #6 of 10 Old 08-17-2017, 06:24 PM Thread Starter
Gordknight412
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Quote:
Originally Posted by aeroshots View Post
Any suspension mods done lately like lifts etc.?
No everything is stock still.
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post #7 of 10 Old 08-18-2017, 10:40 AM Thread Starter
Gordknight412
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Anyone else have any input? What would be the main symptom difference between it being the rear dif pinion or input shaft bearing?
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post #8 of 10 Old 08-18-2017, 11:36 AM
TJnBC
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start by taking off your rear shaft completely and throw it in 4HI and see if the noise is still apparent. If it is, put it back in , take out the Front shaft and drive in 2HI , see if the noise is still there.

Process of elimination will point to where it is coming from. Then you can go from there.
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post #9 of 10 Old 08-21-2017, 08:01 PM Thread Starter
Gordknight412
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Thanks everyone for the help. It was the rear pinion bearing. It was shot. Had my entire rear diff rebuilt at a good price. Sound is gone. Thanks!
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post #10 of 10 Old 08-25-2017, 07:43 AM
aeroshots
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Great
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