Transmission fluid change

ACPR140

MEMBER
2006 FORD F-350
6.0L
V8
TURBO
4WD
AUTOMATIC
400,000 MILES

Hello 2CarPros team,

I just inherited the truck listed above (dually) with 410,000 miles.

Would you advise against changing the differential fluid and transmission fluid on this high mileage vehicle?

I only ask because it’s common for people to make the statement that changing the fluid this late in the game would cause issues.

Knowing who the past owner was I assume none of the fluids have ever been changed.

Thank you.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

That is a tough call. It is really based on how dirty the transmission fluid is at this point. If it is black and smells, new fluid could lead to a slip by cleaning the clutches. As far as the differentials, I can't imagine it would hurt servicing them. Actually, it may be a good idea.

Here is a link that shows how it's done:

https://www.2carpros.com/articles/differential-service

Now, based on which differentials you have, you will need to get the correct fluid. Here is all the technical info for fluid types and capacity:

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2006 Ford Truck F 350 4WD Super Duty V8-6.0L DSL Turbo VIN P
Fluid Types and Capacities
Vehicle Maintenance Fluids Fluid - Differential Specifications Fluid Types and Capacities
FLUID TYPES AND CAPACITIES
Fluid Types

Differential Fluid Type

FRONT AXLE LUBRICANT SPECIFICATIONS

Motorcraft SAE 80W-90 Premium Rear Axle Lubricant

Ford Part Number .................... XY-80W90-QL

Ford Specification .................... WSP-M2C197-A

REAR AXLE LUBRICANT SPECIFICATIONS

DANA 80

Motorcraft SAE 75W-90 Synthetic Axle Lubricant

Ford Part Number .................... XT-75W90-QLS

Ford Specification .................... GL-5

DANA S110/S130

Motorcraft SAE 75W-140 Synthetic Rear Axle Lubricant

Ford Part Number .................... XY-75W140-QL

Ford Specification .................... WSL-M2C192-A

Ford 10.50 Inch Axle

Motorcraft SAE 75W-140 High Performance Rear Axle Lubricant

Ford Part Number .................... XY-75W140-QL

Ford Specification .................... WSL-M2C192-A

NOTE: Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or equivalent meeting Ford Specification EST-M2C118-A for complete refill of limited slip Ford axles. Ford design rear axles contain a synthetic lubricant that does not require changing unless the axle has been submerged in water.
Capacities

FRONT AXLE LUBRICANT CAPACITY

DANA Super 60 .................... 3.02 Liters (6.38 pints)

REAR AXLE LUBRICANT CAPACITY

Dana 80

Conventional and Truetrac .................... 4.0 Liters (8.5 pints)

Trac-Lok* .................... 3.8 Liters (8.0 pints)

*First fill the axle with 0.2365 liters (0.5 pints) of Additive Friction Modifier C8AZ-19B546-A or equivalent meeting Ford specification EST-M2C118-A.

Dana S110 and S130

Capacity .................... 6.6 Liters (14 pints)*

*The lubricant capacity will vary depending upon the housing mounting angle. The capacity given is for an angle of 4 degrees. A lubricant level close enough to the bottom of the fill hole to be seen or touched is not sufficient. The lubricant must be level with the fill hole.

Ford 10.50-inch Ring Gear

10.50 Inch Axle (1) .................... 3.3 Liters (6.9 pints)

(1) Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or equivalent meeting Ford Specification EST-M2C118A for complete refill of limited slip Ford axles. Ford design rear axles contain a synthetic lubricant that does not require changing unless the axle has been submerged in water.

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I hope this is helpful. Let me know if you have other questions.

Take care,
Joe