Trans/RDU/PTU service costs

[Chops]

I always thought that a trans flush is not a good idea. Dealer said that it's ok unless you have 100K and it's the first service. Your thoughts ?

Typically there is so much clutch debris in old ATF (100K mi+) that it is better just to leave it be instead of flushing it.

I once did an initial drain & fill (not flush) on a ten year old Vibe/Corolla 200K mi+ engine. It shifty jerky for a hundred miles or so. Once the old ATF mixed in with the new it got back to shifting normally. Whew…

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[Chops]

The EB transmission holds about 8 quarts, but only drains about 4 quarts with a drain & fill.

Where in the transmission does the other half remain to avoid the drain plug hole?

 

[Hot Runr Guy]

The EB transmission holds about 8 quarts, but only drains about 4 quarts with a drain & fill.

Where in the transmission does the other half remain to avoid the drain plug hole?

Torque converter?

HRG

 

[Toddman45]

FYI, RockAuto has the 5-qt jug back in stock, but must buy in quantities of 3.

HRG

RockAuto's where I got my one gallon lowest price.

Wow $700 seems like a lot. Was that for just drain and fill on all three (transmission, ptu, rdu) or for flushes? I have a AWD Hybrid so may have to tackle these fluid changes myself.

It's absurd just for a drain and fill on those three units.

It's less than $150 in fluid so that tells you where the rest of the cost is.

 

[801Maverick801]

If you leave your drain plug out overnight, you will get atleast another quart out of the Transmission. I got 6 quarts out the last couple times I did it.

 

[bobaguy]

Nice, I would go Rock Auto for sure then! Based on my research, checking the factory spec sheets, and talking to a local Ford dealer, you don't need a second bottle for the rear diff. 1 bottle of each gear oil is plenty.

I’ve seen a ton of conflicting information online about the fluid amounts, but that's usually because people confuse the total "dry factory capacity" with what actually comes out during a standard service. Just a heads up, I haven't physically done the service on my own Tremor yet (planning to soon), so definitely verify your levels as you fill!

Here are the spec capacities for a standard drain and fill:

• PTU (Front): The unit is tiny. It only drops around 13 oz. (1 Quart of 75W-85 leaves you plenty extra).
• RDU (Rear): The total capacity is 28 oz. (1 Quart bottle is 32 oz, so it fills it right to the brim with 4 oz to spare).
• Transmission (8F35): The total dry capacity is around 8.5 quarts, but a ton of that stays trapped in the torque converter. A standard pan drain-and-fill only drops about 4.5 quarts. (The 5-Quart jug of Mercon ULV covers it perfectly).

Here is the part number breakdown from my order if you want to copy them:

• MOTORCRAFT XT125QULV Mercon ULV; 5 Quart — $34.79
• MOTORCRAFT XY75WQL SAE 75W Disconnect Rear Drive Unit Fluid (1 Qt) — $33.79
• MOTORCRAFT XY75W85QL SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant (1 Qt) — $25.99

I assume these parts are the same for the 2025 hybrid model as well? I plan to change all these before summer is over. Very helpful info, thanks.

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