Mother in laws 21 expedition was bought used with 60,000 miles. It has about 75,000 now. I know the dealer says 150,000 but they like to sell rebuilt transmissions. Some say change the filter and fluid in the pan and don't flush. (I wouldn't flush this high mileage trans anyway). Then change the fluid in the pan after another 10,000 miles. One Ford tech I listened to said to put synthetic Amsoil ulv in instead of Ford ulv. I just need a little information from those who have dealt with 10r/80 transmission.
Change trans fluid/filter or not?
- Thread starter Willie G
- Start date
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spo0587
Active Member
Just changed mine at 130K. Drain and fill with new filter. Went with Raybestos filter. No issues. Got about 5-6 quarts.
Bombtech59
Member
Changed mine at 58000, new filter, ford ulv and a new pan with a drain plug.
Yes to changing the fluid and filter. After 21MY, the transmission had some upgraded parts that made them more reliable. If you are planning to keep vehicle long term, you may want to price out a powertrain warranty through ESP; these 10R80s are quite expensive to replace.
What were the upgraded parts?
Upgraded parts - FlyingWrenches on YouTube has a few videos on this. He’s a former Ford Dealer mechanic now independent who has rebuilt a bunch.
(Below are shorts, several minutes each)
Here’s one - New parts at overhaul
Here’s another - $6k overhaul cost
Most common failure point for 10R80 up through 2022 - bushing improved 2023+
(Below are shorts, several minutes each)
Here’s one - New parts at overhaul
Here’s another - $6k overhaul cost
Most common failure point for 10R80 up through 2022 - bushing improved 2023+
GixxerJasen
Full Access Members
Eh, you get all new fluid and filter when it's rebuilt/replaced every 50K miles, right? 
So sad.
So sad.
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