High Pitch Whine

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Mar 5, 2008 | 07:01 PM

tsconver

Thread Starter

Seasoned Member

Joined: Feb 2008

Posts: 339

Likes: 2

From: Durham, NC

Year: 2003

Model: Grand Cherokee

Engine: 4.0L, 63mm TB, FIPK, Gibson Exhaust

High Pitch Whine

Any ideas what would cause a high pitch whine, seems to only be noticeable when in high gear and under load, it goes away when you let off the throttle. Do not hear it except in OD.

Rearend bearing?

Last edited by tsconver; Mar 5, 2008 at 08:05 PM.

Mar 5, 2008 | 07:04 PM

jonb8

CF Veteran

Joined: Feb 2008

Posts: 1,665

Likes: 10

From: Elizabeth WV

Year: 1998

Model: Cherokee

Engine: 4.0

maybe torque converter.

Mar 5, 2008 | 08:06 PM

tsconver

Thread Starter

Seasoned Member

Joined: Feb 2008

Posts: 339

Likes: 2

From: Durham, NC

Year: 2003

Model: Grand Cherokee

Engine: 4.0L, 63mm TB, FIPK, Gibson Exhaust

Quote:

Originally Posted by jonb8

maybe torque converter.

sounds more from back

Mar 9, 2008 | 07:13 PM

tsconver

Thread Starter

Seasoned Member

Joined: Feb 2008

Posts: 339

Likes: 2

From: Durham, NC

Year: 2003

Model: Grand Cherokee

Engine: 4.0L, 63mm TB, FIPK, Gibson Exhaust

Well I did a full 4wd service todat. Put Royal Purple 75w140 in both diffs, the old oil looked pretty good, i cleaned them out with spray cleaner and the gears all look great and no metal shavings in either. No idea on the whine unless it is a drvieshaft / ujoint issue. Transfer case looked great too, oil was clean replaced with Mopar ATF+4. Guess I will drive it and see what the deal is maybe fresh oil will quiet it down.