Vibration with gears and one piece driveshaft - Mustang Evolution

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Old 10-29-2015, 01:28 PM   #1
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Vibration with gears and one piece driveshaft

Hey guys,

Just trying to get some ideas as to why this is happening. 2011 mustang v6. I had the one piece driveshaft before and everything was fine. Car had stock gears so we put 3.73s. Now the car vibrates when you let go the gas at speeds over 65mph. The vibration increases if you go faster. It doesn't vibrate when you accelerate or are holding the gas cruising at high speeds, it only does it when no gas I given to the car. This only started after the gears were changed. They gears are done correctly because there is no whine or grind. This car has every bolt on for a v6 so it's quite powerful. Thanks for the help


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Old 10-29-2015, 01:32 PM   #2
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if they removed your DS to put in gears did they put it back in the same position?

I would NOT exclude the gears being the culprit.....
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Old 10-29-2015, 01:39 PM   #3
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Also confirm pinion angle. This is very important.
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Old 10-29-2015, 01:41 PM   #4
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pinion Angle is off and if you drive too long on it will really mess up your seals bearrings and gears. Been there... Had to replace myself same reason
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Old 10-29-2015, 01:42 PM   #5
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Yes, they removed on side of the drive shaft to put the gears. Not sure if it was put in the same position but I did rotate the driveshaft 180 degrees and that didn't help.


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Old 10-29-2015, 01:45 PM   #6
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Yea it wont in this case. There are tools you can get to check the pinion angle yourself, but its best to just take it back to them and tell them whats up. I would.
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Old 10-29-2015, 01:50 PM   #7
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Quote:
Originally Posted by Sterlingbeast5.0 View Post
pinion Angle is off and if you drive too long on it will really mess up your seals bearrings and gears. Been there... Had to replace myself same reason

The car has stock suspension and it doesn't have an adjustable UCA. How would I adjust the pinion angle? Will I need to purchase and adjustable UCA?


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Old 10-29-2015, 02:20 PM   #8
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Try rotating the shaft another 90 degrees. If you are at stock ride height, I wouldn't expect the pinion angle to be off unless something weird is happening.

Could also be something amiss with the gear set.
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Old 10-29-2015, 03:31 PM   #9
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Sounds to me like the infamous dual mass flywheel. It happens ONLY when i let of the gas between 3000 and 2600 rpm. I have the stock DS.

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Old 10-29-2015, 03:47 PM   #10
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To be honest, vibration is such a hard thing to offer advice on over the computer. Soo many things can cause it. It is best to take it back in.
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Old 10-29-2015, 03:55 PM   #11
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Originally Posted by FastFord13 View Post
Sounds to me like the infamous dual mass flywheel. It happens ONLY when i let of the gas between 3000 and 2600 rpm. I have the stock DS.

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Good thought...didn't catch if OP had manual or automatic.
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Old 10-29-2015, 03:59 PM   #12
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Originally Posted by tym_v6 View Post
Good thought...didn't catch if OP had manual or automatic.
Yeah I didn't know what he has, just threw it out there. If its a manual its a good chance its just the dual mass. The probable reason that he didn't feel it before is because at 65 he's around 2500 with 3.73s as with 2.73s he was much lower and it wouldn't happen.
If he's auto I agree take it back and have it looked at.


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Old 10-29-2015, 04:08 PM   #13
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Originally Posted by FastFord13 View Post
Sounds to me like the infamous dual mass flywheel. It happens ONLY when i let of the gas between 3000 and 2600 rpm. I have the stock DS.

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+1 my guess is this as well. Notice I say guess because it is extremely hard to diagnose vibration issues without actually feeling it.
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Old 10-30-2015, 05:24 AM   #14
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from what OP has done "every bolt on" and that he already indexed the DS he knows the dual mass flywheel vibration.
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Old 10-30-2015, 06:51 AM   #15
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Also he said he had the ds before gears with no problem, so pinion angle shouldn't be an issue all of the sudden. It's possible clocking it another 90 might help or maybe something is off in the rear end.

I'd take it back to who did the gears for an opinion since it didn't do it prior.
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Old 10-30-2015, 07:09 AM   #16
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Another vote for the dual mass flywheel causing it. It'll vibrate in any gear with the rpm's in the 2500-3000 range. With 3.73 gears, you're pretty well up their for it to vibrate when going 65 or faster in 6th gear.
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Old 10-30-2015, 07:15 AM   #17
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I think as the clutch and flywheel wear more that dual mass vibration gets way worse. On my 2011 with 105k miles, i get it alot. On my other 2011 i had, it wasnt near as bad or often.

Sucks a new clutch, flywheel, and labor is soo much.
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Old 10-30-2015, 07:24 AM   #18
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I remember someone having V issues that they traced to excess locktite getting into the DS flange.




or they dropped his DS.....
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Old 10-30-2015, 07:27 AM   #19
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I will mention again the DM fly is one of the worse things about my car



V6 is other..............................
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Old 10-30-2015, 03:08 PM   #20
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what exactly is dual mass flywheel and is it on the gt
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Old 10-30-2015, 04:52 PM   #21
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My 373 gears whine bad at starts at 40mph

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Originally Posted by Strange Mud View Post
I will mention again the DM fly is one of the worse things about my car



V6 is other..............................
Did u try to rotate the driveshalf 180 degrees? Anyone have any ideas about the whine?
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Old 10-30-2015, 05:01 PM   #22
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Yes I agree. So many different things could cause vibration. Just take to the shop and have it looked over
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Old 10-30-2015, 05:10 PM   #23
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Originally Posted by rickb9ol View Post
what exactly is dual mass flywheel and is it on the gt
it is a 2 part flywheel with the parts attached by springs. In theory it rdeuces vibration from the inherent unbalance of a V6 engine....in the real world once you get engine rpms over 3500 rpm when you lower rpms to around 2500 it starts some type of nasty vibration. In my car I swapped out motor mounts to tighten up engine movement (shifting improvement) which makes the vibration feel like mild rumble strips. It will persist from 2500-2300 approx rpms this happens in any gear.

Nope V6 only
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Old 10-30-2015, 11:56 PM   #24
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I found an interesting animation of how a DMF works. It seems it would be quite effective and I suppose that without it you would have that vibration at all speeds instead of a 2 to 300 rpm range. Still must be annoying I'm sure. Autos like I have don't have the DMF because of the Torque converters vibration damping.
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Old 10-31-2015, 11:45 AM   #25
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^^ I would like for someone with an aftermarket flywheel to chime in on this. When my car needs a new clutch, I was going to go with a good stage 1 clutch with an aluminum flywheel.
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Old 10-31-2015, 03:52 PM   #26
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It seems likely that a single piece flywheel would have more vibration at all speeds than the dual mass version. I can't see why Ford would use what they did otherwise.
Just about every Diesel car has a DMF because of the greater inherent vibrations of the diesel engine so the Cyclone must have similar characteristics. I think that 60 degree V6's are not that naturally smooth running.
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Old 11-01-2015, 12:00 PM   #27
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I found an interesting animation of how a DMF works. It seems it would be quite effective and I suppose that without it you would have that vibration at all speeds instead of a 2 to 300 rpm range. Still must be annoying I'm sure. Autos like I have don't have the DMF because of the Torque converters vibration damping.
Very helpful! Thanks!
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Old 11-01-2015, 03:26 PM   #28
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It seems likely that a single piece flywheel would have more vibration at all speeds than the dual mass version. I can't see why Ford would use what they did otherwise.
Just about every Diesel car has a DMF because of the greater inherent vibrations of the diesel engine so the Cyclone must have similar characteristics. I think that 60 degree V6's are not that naturally smooth running.

idk but THINK it reduces vibration some most of the time but when it starts...ye-haw. I find it annoying as it won't stop unless you change rpms sometimes ya just want to cruise at it will force you to change.
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Old 11-02-2015, 04:12 PM   #29
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Hey I had an aluminum driveshaft that i purchased from American muscle...when I hit 127 mph it exploded..it even broke my tranny where its connected from the driveshaft...i also have 4.10 gears installed..I'd post a pic but idk how to do it through here..
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Old 11-02-2015, 09:33 PM   #30
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Hey I had an aluminum driveshaft that i purchased from American muscle...when I hit 127 mph it exploded..it even broke my tranny where its connected from the driveshaft...i also have 4.10 gears installed..I'd post a pic but idk how to do it through here..
Who was the manufacturer of the driveshaft?
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Old 11-02-2015, 10:46 PM   #31
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It was the driveshaft shop...i bought it on American muscle for 7 sum...not even 3 months installed and it gave out....i wouldn't recommend it to anybody....
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Old 11-03-2015, 10:45 AM   #32
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It was the driveshaft shop...i bought it on American muscle for 7 sum...not even 3 months installed and it gave out....i wouldn't recommend it to anybody....
Are you checking into the warranty on them. I think it's one year.
I was looking at them and they say they're high speed balanced at 9500 RPM.
With your 4.10 gears you may have exceeded that RPM.
I didn't bother figuring it out, but I'd bet you did.
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Old 11-03-2015, 12:14 PM   #33
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I have the same driveshaft on my 2014 Auto with headers, tune, intake, 3.73s, etc. I have been to SA Raceway multiple times and the driveshaft is fine. Went as high as 105 MPH.

Having that gear ratio or higher though might be a "At your own risk" type of thing. Especially if you are hitting over 120 mph with 4.10s. Hopefully you didnt hit that speed on a Public road. :/ Because I barely got over 100 in the 1/4 mile.
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Old 11-06-2015, 05:38 PM   #34
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I did my clutch (spec) and flywheel (also spec) at like 10,000 miles because I had a bad vibration. Also did clutch line and throwout too while I was at it and from Ford my clutch always felt bad. In any case the throwout was leaking slightly.

The DMF is a nightmare as stated. I have an aluminum driveshaft, 373 gears as well and the new aluminum flywheel stopped all vibration I was getting. Highly recommend it. Also have a Barton short throw and the whiteline trans mount too. The trans mount added vibration and noise from the trans which makes it sound like a coffee bean grinder but did improve shifting so I am happy with it from that aspect.

My guess for the OP issue is either DMF or something is a miss with the gears. Do the gears whine or howl? If so, is it on decal or accel or both?
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