-
Sign Up! To view all forums and unlock additional cool features
Welcome to the #1 Fiesta ST Forum and Fiesta ST community dedicated to Fiesta ST owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the Fiesta ST Forum today!
Weird transmission sounds, finally caught on film
- Thread starter Clint Beastwood
- Start date
It was a mad bearing howl that started in 4th gear and eventually went into 5th and then 6th gear. The exact failure was never pin pointed due to no Tear down being authorized by ford and Just a full on replacement installed instead. As soon as I got it home....I drained the Transmission and put in 2L/ 2Qts. Of Ravenol 75w80 MTF-2. Been a happy camper ever since doing so.
Sent from my SM-N950U1 using Tapatalk
Sent from my SM-N950U1 using Tapatalk
OP
Thread Starter
#43
Thread Starter
#43
Did you have to work at getting it replaced, or once they replicated the issue it was pretty much a "yeah its f*cked" situation?
I don't think they actually needed to replace my axles, things *did* quiet down significantly after they swapped them for a while, but then overnight it pissed out what looked like a quart of trans oil onto my driveway and had to have new seals installed after 24 hours. I have no way of knowing if it was under-filled before that, but it was *definitely* low when I drove it back to the dealership. Since the axle swap its just been getting louder and louder.
My whine/hum seems to be in 3rd and 4th gears. If you are driving on flat ground and let off throttle/on throttle/off throttle/on throttle the "slapping" from the trans is extremely audible, and its the same "quality" of sound as the whirring/grinding I get when coming to a stop. The whirring/grinding is starting to be present when I am coasting on flat ground, but it still most audible when you are decelerating, take the car out of gear, let off the clutch and brake somewhat hard. The sounds always there, but it's loudest then. I can't find a TSB for the trans being underfilled, but if they're going out almost half underfilled thats a big problem and topping off the fluid just offloads the issue onto the purchaser.
I don't think they actually needed to replace my axles, things *did* quiet down significantly after they swapped them for a while, but then overnight it pissed out what looked like a quart of trans oil onto my driveway and had to have new seals installed after 24 hours. I have no way of knowing if it was under-filled before that, but it was *definitely* low when I drove it back to the dealership. Since the axle swap its just been getting louder and louder.
My whine/hum seems to be in 3rd and 4th gears. If you are driving on flat ground and let off throttle/on throttle/off throttle/on throttle the "slapping" from the trans is extremely audible, and its the same "quality" of sound as the whirring/grinding I get when coming to a stop. The whirring/grinding is starting to be present when I am coasting on flat ground, but it still most audible when you are decelerating, take the car out of gear, let off the clutch and brake somewhat hard. The sounds always there, but it's loudest then. I can't find a TSB for the trans being underfilled, but if they're going out almost half underfilled thats a big problem and topping off the fluid just offloads the issue onto the purchaser.
Took the Tech on a test drive....everything turned off stereo....HVAC Etc. Was like a 2 min test drive....Tech was like... Yeap definitely an issue going on. Sent a Ford Rep. Out the next Day to decide if it was a Teardown or Remove and Replace with A new Unit. Ford Deemed it non Teardown and then installed a new unit. So maybe 3 days before I had the Vehicle back in my possession.
Sent from my SM-N950U1 using Tapatalk
Sent from my SM-N950U1 using Tapatalk
Nope. It needs a whole transmission...
Update:
pulled the transmission and opened it up. Input shaft had an unusual amount of play in it. Unbolted the gearsets, attempted to remove them, and the input shaft fell out.
Turns out the input shaft broke between gears 2 & 3. Cracked clean in half. There was NO metal in the transmission fluid. I was so sure it was a bearing.
Oh well. New transmission on the way.
Update:
pulled the transmission and opened it up. Input shaft had an unusual amount of play in it. Unbolted the gearsets, attempted to remove them, and the input shaft fell out.
Turns out the input shaft broke between gears 2 & 3. Cracked clean in half. There was NO metal in the transmission fluid. I was so sure it was a bearing.
Oh well. New transmission on the way.
Nope. It needs a whole transmission...
Update:
pulled the transmission and opened it up. Input shaft had an unusual amount of play in it. Unbolted the gearsets, attempted to remove them, and the input shaft fell out.
Turns out the input shaft broke between gears 2 & 3. Cracked clean in half. There was NO metal in the transmission fluid. I was so sure it was a bearing.
Oh well. New transmission on the way.
Update:
pulled the transmission and opened it up. Input shaft had an unusual amount of play in it. Unbolted the gearsets, attempted to remove them, and the input shaft fell out.
Turns out the input shaft broke between gears 2 & 3. Cracked clean in half. There was NO metal in the transmission fluid. I was so sure it was a bearing.
Oh well. New transmission on the way.
Sent from my iPhone using Tapatalk
I’m curious as well…what is the cause? I’m guessing it’s correlated with the “clank”. I noticed there appears to be a lot of back lash in the transmission. Someone mentioned it could be play in the differential.
The clean break appears to have been where a machined groove is on the shaft. Is that correct?
The clean break appears to have been where a machined groove is on the shaft. Is that correct?
Last edited:
So my fabricator friend seems to think it was a flaw in the original forging process. There may have been an air bubble in the metal and it never released (hence the dimpled shiny part), then being driven really hard just exacerbated it. The car is driven daily (hard) and driven on the track, it has been drag racing exactly twice. So I'm not sure how much sense it makes to be from shock, but it could be.
OP
Thread Starter
#54
Thread Starter
#54
Thats how it feels. There's so much "slop" inside the transmission.
Let off gas, split second later "thunk" as the slop is taken up, back on gas, split second later" thunk" as the slop is taken up in the other direction.
It's not the same sort of slop as before the cobb RMM, it feels like its inside the trans, like i can feel it through the shifter and clutch pedal.
Let off gas, split second later "thunk" as the slop is taken up, back on gas, split second later" thunk" as the slop is taken up in the other direction.
It's not the same sort of slop as before the cobb RMM, it feels like its inside the trans, like i can feel it through the shifter and clutch pedal.
Mine had that backlash-like click/clunk since I bought it with 2,500mi. The previous owner mentioned how tricky the car was shifting in lower gears, so perhaps he fucked it up in the time he had it, idk.
The weird thing is, is that it sounds exactly the same as when you change gears when the clutch is depressed; which I know is the linkage noise and harmless.
And if the clutch is depressed, there's no way the noise is backlash... Nontheless, there is natural backlash in these transmissions, as with any gear box. The question remains, is it excessive? [emoji1745]
2017 w/Recaros - bone stock
The weird thing is, is that it sounds exactly the same as when you change gears when the clutch is depressed; which I know is the linkage noise and harmless.
And if the clutch is depressed, there's no way the noise is backlash... Nontheless, there is natural backlash in these transmissions, as with any gear box. The question remains, is it excessive? [emoji1745]
2017 w/Recaros - bone stock
OP
Thread Starter
#60
Thread Starter
#60
They’re saying it’s my brake rotors. Despite the issue existing before and after replacing the pads and rotors in the last 5k miles. :facepalm:
When I demonstrated the driveline “slapping” he made a weird face then blanked back up and said it might be normal.
I do not enjoy the mushroom treatment.
When I demonstrated the driveline “slapping” he made a weird face then blanked back up and said it might be normal.
I do not enjoy the mushroom treatment.
Similar threads
-
HELP! My ongoing Weird ST issue...- Started by Grombil
- Replies: 17
-
Weird clunking noise front right passenger wheel.- Started by Original J-Pat
- Replies: 17
-
-
Weird issue with estimated miles to empty reading- Started by Stkid93
- Replies: 3
-
-
-
-
Weird issue with OEM infotainment / SYNC 3- Started by Charlie
- Replies: 4
-
Weird Tachometer Dip on Acceleration in 5th and 6th gear
- Started by Elijah
- Replies: 2
-
