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98 F150 CHATTERING/VIBRATION FROM REAR DRIVE SYS


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HAL_L_HUNT
New User

Feb 10, 2011, 12:18 PM

Post #1 of 4 (2906 views)
98 F150 CHATTERING/VIBRATION FROM REAR DRIVE SYS Sign In

98 FORD F150 4WD 4.6L 143K MILES

chattering or vibration seems to be coming from the rear end drive sys
only happens when accelerating from a stop and turning at the same time
doesn't do it till its reached operating temp.
doesn't do it when driving straight ahead
doesn't do it when turning and not accelerating
doesn't do it at higher mph approx. above 20 mph
fyi- replaced rear wheel oil seal last summer
fyi- put in 90wt gear oil instead of recommended 180wt


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 10, 2011, 12:39 PM

Post #2 of 4 (2904 views)
Re: 98 F150 CHATTERING/VIBRATION FROM REAR DRIVE SYS Sign In

The problem is likely the oil change you made. This appears to be a limited slip differential which require a "friction modifier" additive. i would have it changed again and this time use the additive.
Here are the fluid requirements for that truck


Motorcraft Synthetic Rear Axle Lubricant part number F1TZ-19580-B.
Meeting Ford specification WSL-M2C192-A.
This is also called SAE 75W-140 High Performance Rear Axle Lubricant.

With additive:
Ford Friction Modifier part number C8AZ-19B546-A.
Meeting Ford specification EST-M2C118-A.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



HAL_L_HUNT
New User

Mar 14, 2011, 3:14 PM

Post #3 of 4 (2866 views)
Re: 98 F150 CHATTERING/VIBRATION FROM REAR DRIVE SYS Sign In

PROBLEM FIXED. THANK YOU VERY MUCH


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 14, 2011, 3:19 PM

Post #4 of 4 (2862 views)
Re: 98 F150 CHATTERING/VIBRATION FROM REAR DRIVE SYS Sign In

You're welcome.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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