Transmission shudder

[flynavy]

I had an odd shutter on the highway at 80 when I would feather in the throttle. No codes for every day driving and the missfire count looked fine. I got on it hard a few times with the right conditions and I was finally able to get the coil to show a fault and flash the cel.

Replaced the #1 coil that caused the cel flash and all was good after that.

Interesting. I just replaced plugs, no change. My shudder seemingly went away with a new TC but came back a few hundred miles later. Did you do all this through Forscan?

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[bjl95mustang]

I was able to get the coil to fail and send the truck into reduced power mode twice. This for me was turning into a highway feeder and full throttle on a slight incline. When it went over 5k rpm it miss fired. For me both times was coil #1 when I scanned it. You can see missfire count for that drive cycle in forscan. Drive it then scan before you turn the truck off. But like I said in my case everything always looked ok.

I started with changing out the coil that was giving me issues. Been fine since.

 

[flynavy]

I just checked fluid and it’s on the 4 mark, should be between 5-6… clearly overfilled of course. I bet they dumped 12 in and called it a day. Would this manifest as these symptoms I’m having?

 

[flynavy]

Drove with district rep today. He’s been in the business 20+ years so I truly value and trust his opinion. He is 99% confidence it’s not transmission related.

he drove with me and felt it in the pedal and not the steering wheel. He thinks it’s just driveline/tire related and wants to throw a different tire on to test.

I’m a little torn because I just don’t believe it… how could the shudder kind of go away and then come back? We’ll see what he says.

 

[Tsuga]

Drove with district rep today. He’s been in the business 20+ years so I truly value and trust his opinion. He is 99% confidence it’s not transmission related.

he drove with me and felt it in the pedal and not the steering wheel. He thinks it’s just driveline/tire related and wants to throw a different tire on to test.

I’m a little torn because I just don’t believe it… how could the shudder kind of go away and then come back? We’ll see what he says.

I have had the Torque Converter replaced, drive shaft, spark plugs, one coil, engine mounts and recently I had my tires replace to Bridgestone Alenza Prestige. It still shudder at 55 to 70 when lightly throttling.

 

[jafo]

I've had the Hybrid drive unit replaced twice. The second time the Ford dealership was directed to do a valve job on the transmission. So far 500 miles later the issue appear to be gone. Before the first Hybrid drive unit replacement not only was there a shudder in 8-10 gear, but lower gears there was hard shifting. Hard shifting disappeared after the first HDU replacement, but the shudder came back after about 300 miles. Hopefully the issue is resolved now.

 

[flynavy]

Still shuddering, getting new tires on today. We’ll see.

 

[flynavy]

New tires ride better of course, went from KO2 to G3's, I'm happy.

Shudder is still there. I did go ahead and buy a 60,000 miles ESP just for powertrain. I want to keep my truck, but I feel like I'm losing my mind on the transmission issues.

On one hand, in theory, nothing major as failed and I have no serious issues. It shudders a little, it shifts OK, and it drives fine. But its hard not to read all of these posts about CDF drum or valve body issues and not be worried. I could drive forever and never have another issue or it could blow up tomorrow, and the lack of evidence building up to one of those answers drives me crazy!

My next step is to play with Forscan and try to monitor misfires or torque converter slippage data and report back. I know I appreciated reading through this long thread for data points.

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