Vibration between 50 & 70 mph

[speedfrk]

I think the hose clamp fix only hides the issue. What happened to BMR Tech in here? I think he was on to something!

No, the hose clamp only fixes any inbalance in the DS, pinion flange, etc. But it really does balance it if done correctly. Crude, but effective. However, if there is a problem with subframe alignment, the hose clamp won't help that problem at all. Alignment, runout and balance are all separate issues but any (or all) of them can cause vibration problems.

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[zanGTA]

I got the irs aligned with the steeda kit. It was out. The vibration has dropped a bit but it is still there. Next week will put in the subframe braces.

I did a tour on cjpp, steeda, lmr etc and i seen those one piece driveshafts: key feature: "reduce vibration". I read other nice words too like "weak", "poor" oem driveshaft.

Anyone tried?

 

[zanGTA]

I tried better the car today, at high speeds it is totally unusable and i would say not safe at all. The vibration from wheel moved to the pedals and seats.

Now it is really a PITA.

 

[shahram72]

OK, I'll post my thoughts below. Just copying from my facebook post on Friday so if something seems odd or out of place.... And I was thinking my driveway was pushing the rear diff to rotate rearward, affecting the drive angle, but this should not happen. But how can it be vibration free one day and have it the next?

I have a lot of time to think on my job. I got so excited at this I had to stop and take a break. I think I know what is causing the vibration issues on the Mustang. Had to do with driveline and u joint angles and movement of the rear suspension subassembly. I should have been an engineer. Unfortunately without a lift, machine shop and mechanical skills, I won't be able to fix it. But I need to talk to some people who specialize in drivelines somewhere in the country. The issue is when the rear rotates forward or back, the rear driveline angle changes but the front does not. This causes the rotation at the diff input flange to not move at even speed. It moves in an elliptical pattern, meaning it speeds up and slows down on every revolution. This is felt in the rear and the stress gets transferred to the diff gears, eating them up. The solution is replacing the rear u joint with a beefy constant velocity joint, but how are we going to do that? The other is stabilizing the rear end, adding harder bushings, and replacing the diff gears again and it will be gone.

 

[keltymd]

OK, I'll post my thoughts below. Just copying from my facebook post on Friday so if something seems odd or out of place.... And I was thinking my driveway was pushing the rear diff to rotate rearward, affecting the drive angle, but this should not happen. But how can it be vibration free one day and have it the next?

I have a lot of time to think on my job. I got so excited at this I had to stop and take a break. I think I know what is causing the vibration issues on the Mustang. Had to do with driveline and u joint angles and movement of the rear suspension subassembly. I should have been an engineer. Unfortunately without a lift, machine shop and mechanical skills, I won't be able to fix it. But I need to talk to some people who specialize in drivelines somewhere in the country. The issue is when the rear rotates forward or back, the rear driveline angle changes but the front does not. This causes the rotation at the diff input flange to not move at even speed. It moves in an elliptical pattern, meaning it speeds up and slows down on every revolution. This is felt in the rear and the stress gets transferred to the diff gears, eating them up. The solution is replacing the rear u joint with a beefy constant velocity joint, but how are we going to do that? The other is stabilizing the rear end, adding harder bushings, and replacing the diff gears again and it will be gone.

close but then CB005 would fix it as it prevents and locks out the IRS Cradle from moving and if you had a 1 piece driveshaft then the cv issue would be solved. I think it is a base design issue with the rear end. I think, judging by the fact that 11-14 owners have rear end issues as well, that the super 8.8 is the issue.

 

[GT Pony]

I tried better the car today, at high speeds it is totally unusable and i would say not safe at all. The vibration from wheel moved to the pedals and seats.

Now it is really a PITA.

What fixes are you trying out?

 

[shahram72]

What's CB005? With all the info here, we got to be able to find the fix that Ford is hiding from us..

BMR Tech, u still here? I think you were on to something? Make any new progress?

close but then CB005 would fix it as it prevents and locks out the IRS Cradle from moving and if you had a 1 piece driveshaft then the cv issue would be solved. I think it is a base design issue with the rear end. I think, judging by the fact that 11-14 owners have rear end issues as well, that the super 8.8 is the issue.

 

[keltymd]

What's CB005? With all the info here, we got to be able to find the fix that Ford is hiding from us..

BMR Tech, u still here? I think you were on to something? Make any new progress?

This is cb005
http://m.bmrsuspension.com/?page=pr...1f1d49e35-E4941E11-F8DD-3235-B247538C0268C010

I liked the feel of iron my car but honestly it made the vibration worse on mine. I have it sitting in the garage for sale now

 

[Winchester 1866]

I'm loosing my hope

What's CB005? With all the info here, we got to be able to find the fix that Ford is hiding from us..

BMR Tech, u still here? I think you were on to something? Make any new progress?

I had tires "balanced" Friday an on drive home thought things. Maybe getting worse. Sat I went back to dealer and dropped off car it was progressively getting
Worse , well when I got home there was a set of weights on driveway and set in street. I'm spoiling because I have expectations. Now I have lowered them to please don't brake anything. My poor wife cried this was the car she always wanted and after33 years of marriage ..... What a disasters

 

[zanGTA]

What fixes are you trying out?

I aligned with steeda kit. Now i'll try to clock the driveshaft and then to balance it.

 

[Rash]

Is it possible that Ford will quietly fix the vibration issue without issuing a TSB? I'm thinking they can make whatever manufacturing adjustment needed going forward without revealing it to previous owners, thus saving them from having to fix hundreds (thousands?) of vehicles that currently have the issue. Since its technically not a safety issue it would be easy for them to do that.

 

[zanGTA]

Does anyone solved the problem replacing the driveshaft with 1 piece ds?

 

[speedfrk]

Does anyone solved the problem replacing the driveshaft with 1 piece ds?

If you read through the whole thread (I know it's huge) there are guys who have done a 1 piece. Mostly, it does not fix it and some guys said it made it worse. I don't think a 1 piece is the answer except for cars mostly used on the track due to the weight reduction. If you were to try one, I think you would need to do the on car balancing thing with the hose clamps since you need to balance the DS, pinion flange and pinion as an assembly.

 

[GT Pony]

I aligned with steeda kit. Now i'll try to clock the driveshaft and then to balance it.

Also check the radial run-out of the entire drive shaft, and the pinions flanges on both ends of the drive shaft.

 

[GT Pony]

Is it possible that Ford will quietly fix the vibration issue without issuing a TSB? I'm thinking they can make whatever manufacturing adjustment needed going forward without revealing it to previous owners, thus saving them from having to fix hundreds (thousands?) of vehicles that currently have the issue. Since its technically not a safety issue it would be easy for them to do that.

Ford released a "Service Message" to the dealerships and it refers to use the vibration analyzer tool and the Workshop Manual to trouble-shoot and fix the problem. Therefore, I doubt Ford will ever release an actual TSB about the vibration issue.

Way back on page 114 of this thread:
http://www.mustang6g.com/forums/showpost.php?p=1399476&postcount=1707

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