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2004-2016 Econoline/F-Super Duty with Dana 70 or Dana 80 Trac-Loc Limited-Slip Differential – Rear Axle Chatter On Turns
Some 2004-2016 Econoline/F-Super Duty with a Dana 70 or Dana 80 Trac-Loc Limited-Slip Differential may exhibit a rear axle chatter during turns.
If normal diagnosis leads to differential clutch chatter as the cause, engineering recommendation is to first add XL-3 Friction Modifier or equivalent, meeting Ford
specification EST M2C118-A to the rear axle lubricant.
For axle fill capacity of 2.84L (6 pints) or less, 1 bottle or 118 ml(4 fl. oz.) of XL-3 
is required.
For capacities exceeding 2.84L (6 pints), 2 bottles or 236 ml (8 fl. oz.) of XL-3 is required.
| Part Number | Part Description |
|---|---|
| XL-3 | Additive Friction Modifier |
The WSM is in the process of being updated to reflect correct quantity.
