Crazy driveline vibration after AR5 conversion - Page 3 - Lexus IS Forum
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post #31 of 46 (permalink) Old 08-09-2018, 01:39 PM Thread Starter
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Update, I tightened the output flange nut a little, about as tight as I could get it. No difference made, running out of things to check.

Any other suggestions from anyone?

'04 5mt MSM
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post #32 of 46 (permalink) Old 08-09-2018, 05:03 PM
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i tried to help you on post 9 but it looks like you may have overlooked it. i may know someone who can help you.

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post #33 of 46 (permalink) Old 08-12-2018, 11:52 AM Thread Starter
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Sent you a PM

'04 5mt MSM
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post #34 of 46 (permalink) Old 01-14-2019, 04:59 PM
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Did you ever figure this out? My car recently started shaking like a mofo at around 60 mph to the point where I am highway cruising at 50mph. Installed AR5 about 6 or 7 months ago and everything was fine up until about a week ago. Ima shove the whole thing off a cliff.

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post #35 of 46 (permalink) Old 01-15-2019, 08:00 AM
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What driveshaft are you using today? I'd guess that something has come loose or failed if it just started.
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post #36 of 46 (permalink) Old 01-15-2019, 09:00 AM
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I'm using a single piece driveshaft shop one. It was working fine so I'm thinking a weight may have fallen off? Does that even happen? In any case, I'm headed over to a driveline shop today during lunch to see if we can figure it out.

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post #37 of 46 (permalink) Old 01-15-2019, 05:51 PM
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driveline issues suck

Maybe your diff mounts just reached that point where they are bad. I realized mine are moving a ton this past week. I am getting the drive shaft hitting the gas tank. So i'm going to redo my entire subframe. Maybe that's why the conventional u-joint 1 piece did not work for me.
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post #38 of 46 (permalink) Old 01-15-2019, 09:29 PM
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We'll see. As much as it sucks to have to pull it out I'm hoping it'll just be in need of a rebalance.

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post #39 of 46 (permalink) Old 01-16-2019, 02:55 PM
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I'm hoping it'll just be in need of a rebalance.
That solved my problem. In your shoes, I'd be tempted to ditch the one piece, find a stock 2 piece and have someone mod the transmission end with an original AR-5 CV joint (or one like it). I wish I'd gone down that route when I did this.
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post #40 of 46 (permalink) Old 01-21-2019, 05:41 PM
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Put the car on the lift. Vibrations were NOT as obvious as under load but still vibrated at aroun 65ish or 70ish. Noticed two weights had fallen off of the DS so uninstalled and got it re-balanced. Diff mounts looked good and nothing jumped out other than the drivers side axle maybe making a sound here and there. Took it out on the highway, same issues. Money spent, box checked, problem unsolved. Rant over. Next.

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post #41 of 46 (permalink) Old 01-25-2019, 08:50 AM
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Keeping in mind that the car ran fine up to a few weeks ago and for the sake of record keeping here goes:

Car starts shaking at around 40mph (10% of the time), 65mph(10% of the time) and 60mph (80% of the time)
Shaking can be felt through the drivetrain (i.e. shifter knob and seats) but not the steering wheel nor any of the plastic trim around the shifter nor the hand brake. These items DO NOT shake at all.
It will start shaking at mentioned speeds when rolling down a hill in neutral.
Driveshaft has been uninstalled, re-balanced, and re-installed to no avail.
Wheels were verified to be balanced.
Put it up on lift and torqued everything down. Nothing seemed to be obviously broken on the rear end and diff mounts seemed in good condition.

Next step would be taking axles out and checking everything thoroughly but need time and more important, the space for this. Or just drop a bunch of cash on an, at best, $5,000 car. At the same time I cannot go over 50ish on the highway so I might have to burn some vacation on the stupid car.

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post #42 of 46 (permalink) Old 01-25-2019, 05:03 PM
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check the axles if everything else cks out...

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post #43 of 46 (permalink) Old 01-25-2019, 05:31 PM
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post #44 of 46 (permalink) Old 02-24-2019, 04:03 PM Thread Starter
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Update:

I had the driveshaft modified to have a longer splined section where it telescopes in and out. This helped SIGNIFICANTLY, and allowed me to drive the car up to 80mph with MUCH less vibration.

After 80mph, the vibration gets bad, but As a daily driver, this was "good enough" to hold me off for the time being, until the school year is over.

It seems that because of the AR5's in and out thrust at the output shaft, the driveshaft needs to be able to accomodate for this plunge. Im guessing this is why the factory Solstice used a CV at the transmission end, and a rubber guibo at the differential flange.


What does this mean?

It looks like it will be necessary to use a plunging CV Joint at the transmission end, and in theory, this SHOULD fix the issue.

The problem is there are no high quality / high performance CV flanges available that fit into the Solstice/Sky AR5 output shaft.

The only brand I have found is Dorman. I am hesistant to use them as they are a standard parts store brand, and I have seen many parts store brand axle CV's fail within 6 months.

Here is a link to the kit, which includes info on the dimensions, spline count, etc.

https://www.dormanproducts.com/p-46711-932-108.aspx

I do not trust it to last for more than a few months, so I am still looking for a better solution before making any decisions. I am also hesistant to weld a used factory Solstice driveshaft CV, as I don't know what kind of life span to expect from it.

I have emailed DSS and am waiting to see if they can get any high performance CV's for the AR5 output flange.

Fingers crossed that I eventually find a solution for this. Any additional input welcomed

Attached is a picture of my current driveshaft
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post #45 of 46 (permalink) Old 02-25-2019, 07:47 AM
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Honestly, with all of the extra stress from this issue I would be going back to a two piece driveshaft. Take your stock one in to a local driveshaft shop and see if they can replicate it but with new replaceable GM u-joints and of course the needed AR5 guibo on the front end.

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