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2011+ V6 Mustang Tech Forum

2011+ Talk | 2011+ GT | 2011+ V6 | 2005-2010 Talk | 2005-2010 GT | 2005-2010 V6 | Shelby GT500 | Mustang Tech 
 

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Unread 07-11-2011   #46 (permalink)
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Apparantly, the driveshafts on the V6 are only rated for 115-120MPH durability-wise... one of the reasons we have a speed limiter around there?
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Unread 07-11-2011   #47 (permalink)
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Quote:
Originally Posted by Mountain View Post
Apparantly, the driveshafts on the V6 are only rated for 115-120MPH durability-wise... one of the reasons we have a speed limiter around there?
just sounds like a weak point ready to be broken, after having it taken it off it looked like a DS from a ford ranger, so i know what my next mod is going ro be.
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Unread 07-11-2011   #48 (permalink)
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Oh, I don't blame you. Im eventually going to replace mine because I don't want to even risk it failing when I take it to autocross or something. Driveshaft loop as well probably.
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Unread 07-11-2011   #49 (permalink)
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Quote:
Originally Posted by farmerbob1111 View Post
I am also curious how they are going to replace the whole car. Do they give you the original price you paid off of a new one...?
The airbag deployment probably screwed the pooch. Cheeper to give him a new car and part the old one out than to replace the airbag system.
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Unread 07-11-2011   #50 (permalink)
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Quote:
Originally Posted by Mountain View Post
Apparantly, the driveshafts on the V6 are only rated for 115-120MPH durability-wise... one of the reasons we have a speed limiter around there?
Well we know that's what the stock tires are rated.
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Unread 07-11-2011   #51 (permalink)
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Quote:
Originally Posted by Mountain View Post
Apparantly, the driveshafts on the V6 are only rated for 115-120MPH durability-wise... one of the reasons we have a speed limiter around there?
In what official Ford publication can I find that info? I can't seem to find it anywhere.
Seems to me that rotational speed shouldn't matter unless it's not balanced properly and tends to whip. If it's not balanced properly you'd know it at any speed above 50 mph.

I believe it's weak, but I also think that it's applied torque related.

Back in the 70's guys used to give'er the gun in reverse, and then drop into drive while she's floored, just to smoke the tires. Lots broke their driveshafts. At least one a night.
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Unread 07-11-2011   #52 (permalink)
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I'd like to get to the bottom of the drive shaft failures also....

Did the tech have any ideas? Was an engineer involved?

It would be nice to hear some feedback from Ford.
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Unread 07-11-2011   #53 (permalink)
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You know Ford is never going to weigh in on something like this. What are they going to say that wouldn't look bad for them. They'll just continue to issue silly TSB's blaming drivetrain failures on things like CAI's. You know that extra 7 hp is just too much for the transmission to handle.

This approach is much more lucrative for them.
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Unread 07-11-2011   #54 (permalink)
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Quote:
Originally Posted by Grok View Post
I'd like to get to the bottom of the drive shaft failures also....

Did the tech have any ideas? Was an engineer involved?

It would be nice to hear some feedback from Ford.
A drive shaft is 'supposed' to have a slip yolk of seriously thick machined steel such as this:



Instead, ford formed some waviness into the thin-walled tube and called it a slip yolk. It’s pretty obvious to me that Ford tried to save a buck and it back fired.
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Unread 07-11-2011   #55 (permalink)
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Quote:
Originally Posted by 740weapon View Post
A drive shaft is 'supposed' to have a slip yolk of seriously thick machined steel such as this:



Instead, ford formed some waviness into the thin-walled tube and called it a slip yolk. Its pretty obvious to me that Ford tried to save a buck and it back fired.
They're breaking beyond the splines though.

That's why I'm curious whether this is bad design, some faulty parts or an outside influence.

I've heard of 3 or 4 failures so far and I'm looking for some pattern.
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Unread 07-12-2011   #56 (permalink)
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I went with Shaftmaster.
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Unread 07-12-2011   #57 (permalink)
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Quote:
Originally Posted by oldncrusty View Post
In what official Ford publication can I find that info? I can't seem to find it anywhere.
Seems to me that rotational speed shouldn't matter unless it's not balanced properly and tends to whip. If it's not balanced properly you'd know it at any speed above 50 mph.
A driveshaft shop that makes some of the aftermarket driveshafts you guys (5.0L and 3.7L a like) buy.

Just because a driveshaft doesnt produce any vibrations you can really feel at those speeds doesnt mean that it isnt going to break due to the speeds.... Its like many other materials and structures - only so much of a certain force can be tolerated before the component just fails. The high speed, centrifugal forces (derived from the speed, diameter and weight of the shaft) along with the torisonal forces can easily, instantly destroy a driveshaft.

You guys talk about tires.... what do you guys think happens to a tire that is rated for 115 mph and is used at 140 mph constantly? It'll eventually just bust apart at the steel belts. You're not necessarily going to feel any vibration from a change in radial force variation that leads up to the failure (maybe a second or two before hand, if that)... its just gonna GO.
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Unread 07-12-2011   #58 (permalink)
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Quote:
Originally Posted by oldncrusty View Post
I believe it's weak, but I also think that it's applied torque related.

Back in the 70's guys used to give'er the gun in reverse, and then drop into drive while she's floored, just to smoke the tires. Lots broke their driveshafts. At least one a night.
VERY weak... i used to do that in my honda way back when (cuz it was auto and 130 hp) and never had an issue lol

Quote:
Originally Posted by Grok View Post
I'd like to get to the bottom of the drive shaft failures also....

Did the tech have any ideas? Was an engineer involved?

It would be nice to hear some feedback from Ford.
driving over time and heat buildup most likely caused mine to break because it twisted in 2 (i told him looked more like it melted smh) and didn't just snap. u can see from the pic i posted earlier in the thread

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Originally Posted by Grok View Post
They're breaking beyond the splines though.

That's why I'm curious whether this is bad design, some faulty parts or an outside influence.

I've heard of 3 or 4 failures so far and I'm looking for some pattern.
exactly... all the ones i've seen are breaking in the thin part of the shaft and not even at the joint

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Originally Posted by Joenpb View Post
I went with Shaftmaster.
just emailed them a little bit ago since it says the v6 manual is out of stock. how are u liking the shaftm feel any different?
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Unread 07-12-2011   #59 (permalink)
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I added the driveshaft the same time I changed the gears from 2.73 to 3.31. So while I noticed a difference, its mostly from the gears. I do have better piece of mind though. :smoke:
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Unread 07-12-2011   #60 (permalink)
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Quote:
Originally Posted by Grok View Post
They're breaking beyond the splines though.
looks like broken inner splines to me:

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