2026 F250 7.3L - First Full Service

[Rutwad01]

2026 F250 7.3l. Is it recommended to do an early fluid change on front/ rear differential? Transmission and transfer case? If so, at what mileage and do you recommend OEM fluids or something better? I have decided that I will change the engine oil and filter by 1000 miles. What do you say about the other fluids?

Thanks!!

 

[ctechbob]

I'd say its up to you.

I changed my rear diff and t-case at 10,000 miles on my 2025 F150. Those parts will probably outlast the rest of the truck.

Don't know what Ford is calling for in the SD's, I suspect LV for the T-Case (I used Maxlife because I but the 20qt box).

Biggest thing will be frequent ATF D&F's on the 10R...100? 140? That's the one part you want to keep clean fluid in always.

 

[rstsco]

Can't say about your Ford, but Honda recommends changing the rear diff fluid in the Pilot at 7500 miles, then every 30k thereafter. Seems they have enough data showing this one-time early fluid change extends the life significantly.

I am planning on changing the other fluids at least by half the recommended interval. Ounce (quart) of prevention thing.

Enjoy your new truck!