Driveline Vibration

[AnotherS197GT]

No, I have a BMR UCA/mount.

 

[michael.konor]

Got it all set to zero, vibration is unchanged. After swapping DS, changing pinion angle between -2 and 0 (and -6 lol), I think I'm going to throw in the towel and have the gears checked, or get another set installed. I can't handle never being able to go over 80 without shaking my teeth out of my head.

You wrote that you swapped DS. Swapped back to stock?

 

[AnotherS197GT]

I went from stock to a 1 piece. I was having vibes with the stock shaft as well. Gonna give it another shot though.

 

[NotaHybrid]

I noticed my vibrations got worse after I put my non adjustable uca on. I'm going to try putting my stock one back on if I can find it.

 

[AnotherS197GT]

Hell nope. I'm not putting that POS back in there. My vibes were there before, they were there after.

 

[fdjizm]

I've pretty much changed everything but rebuild the rear. LOL
let me know what works!

 

[michael.konor]

If you had no vibrations, regardless of which driveshaft was installed, before the gear change. You *have* to go back to the event where things changed and go from there.

 

[AnotherS197GT]

If you had no vibrations, regardless of which driveshaft was installed, before the gear change. You *have* to go back to the event where things changed and go from there.

My thoughts too. I'm gonna throw the stocker on though, just to make my installer happy. I'm sure he'll take care of me. I was hoping that it was something else before I went through the hassle/headache of a rebuild and not having the car for a few days.

 

[cavero]

I noticed my vibrations got worse after I put my non adjustable uca on. I'm going to try putting my stock one back on if I can find it.

Going from that soft pencil-eraser of a bushing to urethane will transfer noticeably more NVH into the cabin

 

[Memphis]

I had a similar situation a couple years ago with a DSS driveshaft. Checked angle, replaced the joints etc. Had it balanced, checked for straightness etc. Ended up going with another company and had 0 issues. Sent the "bad" unit back to the Driveshaft Shop and they told me it had a bad slider that was causing the vibration. I don't know my driveshafts well enough to even begin to tell you what the hell a slider is, but I assume your local driveshaft shop might be able to take a look at it. My two cents.

 

[AnotherS197GT]

I put the stock DS back on and it seems like 95-99% of the vibration is gone. Makes me wonder if the gear installer installed the DS slightly out of phase. But I lined it up with my old marks and his marks on the rear from the gear install. I still have some which I think is coming from my Prothane mounts, but I have new (used) stock mounts on the way. I wonder if my DS is just hiding the vibration, or if its actually gone. I hit 110+ last night and it felt great to me. I'll have to test it out again tonight!

 

[skwerl]

There is a certain amount of vibration inherent in the transmissions, which is why Ford uses a 46 lb, two piece driveshaft in the first place. My 2002 F150 has a factory aluminum driveshaft so Ford is well aware of how to design and build aluminum driveshafts for their vehicles. They must have a damn good reason to put a 46 lb, two piece boat anchor on the Mustangs.

 

[saleen07gt]

I had a similar problem, took the 1 piece ds out, replaced it with the stock one and it was better, sent the 1 piece back to Coastline, they said there was an issue with it and they said it was perfect now. They were right, all vibrations are gone. So yeah, it is possible to have an issue with your stock shaft and your 1 piece.

 

[AnotherS197GT]

I had a similar problem, took the 1 piece ds out, replaced it with the stock one and it was better, sent the 1 piece back to Coastline, they said there was an issue with it and they said it was perfect now. They were right, all vibrations are gone. So yeah, it is possible to have an issue with your stock shaft and your 1 piece.

How much did they charge you to check it? Thought about doing that as well.

 

[saleen07gt]

How much did they charge you to check it? Thought about doing that as well.

I spoke to the owner, believe his name is Bill, told the whole story about my vibration problem, long story short, he didn't charge me but I had to pay for shipping.

 

[AnotherS197GT]

I spoke to the owner, believe his name is Bill, told the whole story about my vibration problem, long story short, he didn't charge me but I had to pay for shipping.

Ah, cool. Mine was used so I assume I will be forking over some cash to get them to check it.

 

[fdjizm]

You got lucky! There is 0 difference in my vibe with both the oem and aluminum DS.

 

[AnotherS197GT]

Well, we'll see. After doing some more driving today, I can still feel it when I let off. I can actually drive over 80 now though, so thats a plus.

 

[RED09GT]

I had a very similar vibe when I had 4.10's.
When I tore the rearend down after blowing the spider gears to bits at the track I noted that my preload on the pinion bearing was completely gone, I suspect that my crush sleeve continued to crush from driving or from launching at the track. I had to put my 3.55's back in and I put in a crush sleeve eliminator and no more vibe.

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[AnotherS197GT]

I've got a solid spacer in there already, and I just drive it on the street with street tires.

I did some more driving today and it seems that the vibration has moved itself to 90+. I'm not sure if I should bother having the rear end taken apart and the gear done again. With my luck it will come back 10x worse. Maybe I'll just trade it in for a 5.0


I really think that its a gear issue and the DS amplified the problem being that it takes up more slop. Unfortunately, I think I will be selling the 1 piece and sticking with the clunky shitty stock DS.


I have been emailing back and forth all day with Coast, and I'm very impressed with their level of service. I came right out and told them I bought the DS second hand and I want to check the balance, and asked for a price. He's been asking me questions all day about my driveline angles instead of just throwing a number out there.