2022 Ford Edge Titanium 2.0 Ecoboost 8 speed automatic transmission #8F35 58,000 miles; owned since new
So I recently have been having some issues with my engine or transmission. When going downhill at low speeds (e.g. 35 mph) around town my engine revs extremely high: around 3000-4000 rpms +/-.
It goes away when I get onto a flat surface and I either accelerate slightly or slow down to speeds of 20 mph or less.
This issue does not occur when going uphill or a flat surface at this speed, only when going at +/- 35 mph downhill. It also does not occur at highway speeds also (engine runs at a normal rpms when going at 45 mph and faster)
No visible leaks from the transmission, engine, or other components under the car or in the engine bay.
Relevant recent service history:
oil and filter changed at 54,500 miles with Ford OEM parts
transmission fluid drained and filled at 54,500 miles with Ford OEM transmission fluid.
rear differential replaced at 38,500 miles with a Ford OEM rear differential.
Purge valve assembly replaced at 56,000 miles with a Ford OEM Purge Valve assembly.
Wastegate Kit replaced at 31,000 miles per Ford SSM 50485.
At the time of this posting there are no DTC’s after performing a code scan at Autozone.
I dont want to have to launch the parts cannon as that can get expensive quickly.
Any ideas?
Sounds to me like the torque converter isn't unlocking.
Unfortunately, this is one of the cursed transmission that Ford and GM partnered on. They're known for premature bearing wear which causes the torque converter to fail. (there are published technical bulletins about it that you can search)
I thought the cursed transmission was the 10 speed from Ford.
that's just the worst one
My car has the 8 speed from Ford.
The 8F35 is derived from the GM 9T50 transmission.
If I am wrong please educate me.
you are wrong. Like I said the TSBs and lawsuits can be found on the web.
No, I don’t think it is slipping.
If you are driving at low speed with transmission in a high gear, but the engine is running at higher revs than normal in that gear then something must be slipping.
I have not heard of any particular problems stemming from the 8 speed 8F35 in my car. If I am wrong please educate me.
Here's a discussion by owners running into problems:
https://www.reddit.com/r/Ford/comments/1q7eay5/ford_transmission_issues_dont_buy/
A blog by a rebuilder:
https://go-powertrain.com/blog/post/ford-8f35-transmission-availability-guide
A Ford TSB describing problems with that transmission in Transit Connect vans:
https://static.nhtsa.gov/odi/tsbs/2022/MC-10226926-0001.pdf
So indicators are that transmission does have some issues.
@chucktobias not necessarily slipping if he's coasting downhill
Is the transmission shifting into a low gear when this happens? Is it slipping?
Is it slipping?
No, I don’t think it is slipping.
Is the transmission shifting into a low gear
Also, no. If I am coasting the engine rpms will “sit” at 3500 rpms going 30 mph while I am coasting then once I get to the bottom and I either accelerate or slow down it will upshift at about 20 mph and/or downshift about 45 mph.
And to @imperator ‘s comment about the torque converter, I thought the cursed transmission was the 10 speed from Ford. My car has the 8 speed from Ford.
I have not heard of any particular problems stemming from the 8 speed 8F35 in my car. If I am wrong please educate me.