whine w/ accel/decel...I checked usual suspects - Jeep Wrangler Forum

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Old 02-06-2007, 04:45 PM   #1
Join Date: Feb 2007
Posts: 1
Markv is on a distinguished road
whine w/ accel/decel...I checked usual suspects

I have had a high pitch whine'ing noise when I accellerate and decellerate. The pitch changes with speed increase/decrease. I bought this Jeep about 6 months ago.

My TJ is a 2002 X, 5spd manual. When I press the clutch in, the noise decreases dramatically or goes away alltogether. It has 60K miles.

I have done a lot of searches and checked the usual suspects. I have changed all the fluids in the Jeep(oil, power steering, TC, manuall transmission, differentials).

At first, I feared that it might be worn out carrier or pinion bearings. I had them inspected by a well-respected offroad specialist shop, who also proceeded to change the fluids. They do a lot of regearing for jeeps, so I trusted them more than the dealer. They reported back that the bearings are in great shape, as are the gears. They believed the noise is coming from the manual transmission, and that it is normal. They suggested I swap the fluid to something like Royal Purple, and see if that helps quiet the noise down.

So, last weekend, I drained the transmission, and replenished with RP syncromax. It shifts a little better when cold, BUT the noise is still there.

I assume that it can't be the wheel bearings. If it was the wheels, I would continue to hear the noise when I press the clutch in while moving.

Maybe this is normal Jeep noise, but it is driving me nuts. Is there anything else I can do to eliminate this noise?
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Old 04-28-2010, 10:17 AM   #2
Join Date: Apr 2010
Posts: 1
armbender1 is on a distinguished road
Same here!

Hi I have an 01 Wrangler that has 4.0 w/5speed.
I just went out of town about 160mile drive. I noticed a little
whine in 5th gear, nothing to worry about. When we got to where we
were going as was driving around it started to whine. Mostly in 3rd and 4th.
1st nothing and second nothing. Is totaly quiet on decel in all gears. I checked the fluid and is fine. There is a little rubbing along with the whine
only in 3rd and fourth thinking is the same because it goes away on
decel also. My Jeep has only 45000 miles and maybe it just got broke in?? HA HA...

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Old 04-28-2010, 10:23 AM   #3
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Join Date: Jan 2009
Location: NE Ohio
Posts: 1,718
snwchris is on a distinguished road
Is it a high whining or more of a chirping sound???

Chirping like a sparrow or bird is usually the front driveshaft u-joints.

The high whine sounds like it's either a bearing in the pulleys or fan clutch.
I had my bearings in the alt on my truck go this past winter and it made the high whine noise. I determined by putting a flat blade screw driver to the alt house while vehicle running and grasp the handle and and listen to see if you hear a grinding noise which would be bad bearings.

98TJ / Hi-Lined / Zip Lockers / 35s

Family Rig / Tow Rig: 08 Tundra & 16ft Trailer
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Old 04-28-2010, 10:26 AM   #4
Join Date: Dec 2009
Location: Lake in the Hills, IL
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ratuna is on a distinguished road
Is it a chirping noise? A bad throw out bearing will start to chirp and if you put the slightest amount of pressure on the clutch pedal it will go away. My 03 Mustang did it constantly, drove me crazy. So I put straight pipes on it, never heard it again!
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