Vibration between 50 & 70 mph

[tj@steeda]

Does the car need an alignment once the alignment inserts are installed?

Yes, you will need an alignment.

Let me know if I can help assist with any questions!

Best Regards,

TJ

Sponsored

 

[hlh1]

Yes, you will need an alignment.

Let me know if I can help assist with any questions!

Best Regards,

TJ

Is an alignment necessary if the "alignment inserts" are not used?

 

[hlh1]

Is an alignment necessary if the "alignment inserts" are not used?

Never mind. The Steeda website clearly shows this. thanks!

 

[CtheProducer]

Guys, installing the Steeda subframe alignment inserts, differential bushing inserts, subframe braces and lowering the car COMPLETELY eliminated my 50-65mph freeway vibration. It was always bad, from day one. Indexing the driveshaft helped a little, but installing these parts made the car butter smooth while cruising down the freeway. Night and day. I'm strong believer in the problem being a rear subframe alignment to the chassis and pinion angle problem.

Which differential bushing inserts did you go with? I just did the subframe alignment, I could tell it moved it back into alignment when installing as I had to shift it over just a tad, easy but still, dang really Ford........

 

[Mustg3]

Besides loosening the 4 IRS sub frame bolts, does anyone know the correct procedure for aligning the IRS? Are special instruments or tools needed. The entire assembly is very heavy and not easy to manipulate.

 

[HoosierDaddy]

Besides loosening the 4 IRS sub frame bolts, does anyone know the correct procedure for aligning the IRS? Are special instruments or tools needed. The entire assembly is very heavy and not easy to manipulate.

If you mean permanently aligning the subframe with the body, as opposed to doing an alignment, the best you can hope for is Steeda's alignment kit. Basically it removes the slop in the passages the bolts to the body go thru.

If you do that, install BMR's CB005 at the same time to keep it from moving around in use (reduces most bushing deflection in undesirable directions).

 

[Dominant1]

 

[tj@steeda]

+1 the Steeda IRS Chassis braces are a great addition too - an owner installed a good combo of Steeda parts earlier in this thread & he said it helped out tremendously!

 

[MikeD1]

+1 the Steeda IRS Chassis braces are a great addition too - an owner installed a good combo of Steeda parts earlier in this thread & he said it helped out tremendously!

I can vouch for that !! When the FE's insisted I remove all my Steeda "Stop the Hop" components, the measured vibrations got worse and the dealer quickly re-installed all if it :doh:.

 

[tj@steeda]

FYI ...

We have had a tremendous amount of success these past couple of weekends & we wanted to share the wealth with our consumers!

For a limited time, save up to 30% off Steeda Manufactured Parts. Check out savings on our IRS suspension components!

Visit us at www.steeda.com

Best Regards,

TJ

 

[Cobra Jet]

Provide input, because here’s a new thought I had about this driveline issue... and it may be “out there”, but could be plausible...

Has anyone given thought that due to the design of the S550 and how the gas tank surrounds the DS and center support carrier bearing, that IF there is any NVH coming from the rotational mass it could be possible the passenger compartment vibe is being exasperated further by the gasoline “rippling” inside of the tank due to the driveline resonance?

Isn’t the fuel tank all plastic now?

The only reason I’m thinking about this (with no real scientific proof or Tech proof) is because many folks have:
1) had original 2-piece DS replaced under warranty with exact same
2) had the original design 2-piece DS replaced by the revised DS as noted in most current Ford SSM
3) had both front trans flange and/or rear pinion flange replaced
4) had center support carrier bearing replaced
5) had axles replaced (usually not the offending part)
6) had entire rear diff replaced (this would be new diff housing w/new gears and pinion flange)
7) given up and TRIED aftermarket Vendor-X 1-piece DS

only to still have excessive driveline NVH or vibes within a very specific MPH/RPM range.

I can’t wrap my head around WHY this problem cannot be fixed permanently even after MANY folks have gone through the above warranty repair efforts.

 

[GT Pony]

Provide input, because here’s a new thought I had about this driveline issue... and it may be “out there”, but could be plausible...

Has anyone given thought that due to the design of the S550 and how the gas tank surrounds the DS and center support carrier bearing, that IF there is any NVH coming from the rotational mass it could be possible the passenger compartment vibe is being exasperated further by the gasoline “rippling” inside of the tank due to the driveline resonance?

I'd think if there was any effect going on like you describe that it would change depending on how much gas was in the tanks. Not sure if anyone has tried to correlate that or not.

 

[hlh1]

Interesting thought, but there are YouTube videos of the drive shaft being out of balance on these cars with vibration.

 

[barrykaye1001]

Provide input, because here’s a new thought I had about this driveline issue...

...only to still have excessive driveline NVH or vibes within a very specific MPH/RPM range.

I can’t wrap my head around WHY this problem cannot be fixed permanently even after MANY folks have gone through the above warranty repair efforts.

Have you checked the transmission to rear axle geometry? If it's out more than a couple of degrees, the DS will bind causing a wobble and vibration. Mine isn't cured yet but neutralizing the trans and diff mounts helped. I'm currently waiting on the revised DS.

Have you tried the app Shimmy Diagnoser? It uses the smartphone's accelerometer to measure the vibration. Based on the frequency and amplitude it can tell if the vibration is DS, Engine or Tire related. Just a thought.

BTW, what's the number of the new Ford SSM related to this issue?

 

[Cobra Jet]

I’m fully aware of the YT vids - and have posted extensively in this lengthy thread - just offering up some new thoughts to the issue as to why the vibe persists on the 2015-2017’s even after multiple attempts to repair via warranty work, aftermarket parts OR DIY.

————
SSM 46767 was the last updated SSM from Ford and that IS the one where the recommended fix is replacing the original DS with the revision. There has not been any recent movement or SSM’s from Ford.
————

BTW - I no longer have the DS vibe worries I went through the Ford Buy Back process and got rid of the 2016 - now in a new 2018 with absolutely no issues at all. So that’s one way to permanently fix it.

Sponsored