These aren't my kinda vibes - Vintage Mustang Forums
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post #1 of 41 (permalink) Old 12-02-2018, 01:05 AM Thread Starter
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These aren't my kinda vibes

I've been chasing driveline vibration for a while now!

Lowered the motor with RM mounts. Shimmed the trans up and added lowering blocks in the back. We're now within 1/4 of a degree driveline angle wise. It has a freshly balanced driveshaft with new spicer u joints. New yoke and trans mount when I put the T5 in.

I don't see anything making contact that isn't supposed to.

Rear wheels were straightened and rebalanced.

Rear end was rebuilt last december. However, when we changed the yoke on the pinion to accept the larger u joint this past week, it was noticed that the pinion support bearing had walked forward. Tapped it back into place and replaced the star clip. Didn't look like there was any damage. Didn't think to check it with a dial gauge for roundness.

The driveline angle sorting got rid of a bunch of vibes, but I still have one from about 60mph onward. It annoys me enough that I don't want to take the car on to the highway.

I'm in to see IWE about the rear end issue on wednesday, but I'm guessing that may not be the cause.

Anyone with any thoughts?
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post #2 of 41 (permalink) Old 12-02-2018, 01:59 AM
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were the RM mounts and T-5 put in at the same time ?

does the vibration intensify if you are in 4th instead of 5th at the same speed ?

have the axles been replaced and / or checked to see if they are bent ?


Z

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post #3 of 41 (permalink) Old 12-02-2018, 09:24 AM
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55 to 60 MPH is classic bad tire resonant mode try swapping fronts to back etc... Good luck
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post #4 of 41 (permalink) Old 12-02-2018, 12:55 PM Thread Starter
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Originally Posted by zray View Post
were the RM mounts and T-5 put in at the same time ?

does the vibration intensify if you are in 4th instead of 5th at the same speed ?

have the axles been replaced and / or checked to see if they are bent ?


Z
The RM mounts were installed after to get the pinion angles right and help clear the TCP monte carlo bar (AC compressor)

Vibration is the same in 4th or 5th. Clutch in or clutch out at those speeds.

I believe they checked everything in the rear end, but they were the original axles.
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post #5 of 41 (permalink) Old 12-02-2018, 12:57 PM Thread Starter
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55 to 60 MPH is classic bad tire resonant mode try swapping fronts to back etc... Good luck
Dobro, that was one of my first thoughts too. The rear wheels were taken to a wheel shop and straightened and everything been balanced. I've swapped front to back too without any luck.
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post #6 of 41 (permalink) Old 12-02-2018, 04:21 PM
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Check that pinion flange that it has no play. Technically you just can't replace the pinion flange and establish correct bearing preload unless you have a solid spacer. But if you have the more common collapsible spacer you only guesstimating. The collapsible spacer is a one time use.

The solid spacer torque is 175 ft lb, some guy's use 124-150 ft lbs for reusing a collapsible spacer. I would be willing to bet you have play in that pinion flange
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post #7 of 41 (permalink) Old 12-02-2018, 05:07 PM
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Take the car to a shop that does "on the car" balancing and have the rears done.

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post #8 of 41 (permalink) Old 12-02-2018, 05:33 PM Thread Starter
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Check that pinion flange that it has no play. Technically you just can't replace the pinion flange and establish correct bearing preload unless you have a solid spacer. But if you have the more common collapsible spacer you only guesstimating. The collapsible spacer is a one time use.

The solid spacer torque is 175 ft lb, some guy's use 124-150 ft lbs for reusing a collapsible spacer. I would be willing to bet you have play in that pinion flange
You may be right. I'm curious as to why the pinion bearing had walked.

It now also sounds like the limited slip is doing funny things.
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post #9 of 41 (permalink) Old 12-02-2018, 05:35 PM Thread Starter
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Take the car to a shop that does "on the car" balancing and have the rears done.
The rear wheels were taken to Greens automotive that exclusively does wheel straightening and repairs and they're now straight as an arrow and well balanced.
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post #10 of 41 (permalink) Old 12-02-2018, 05:37 PM
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The rear wheels were taken to Greens automotive that exclusively does wheel straightening and repairs and they're now straight as an arrow and well balanced.
Trust me.

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post #11 of 41 (permalink) Old 12-02-2018, 05:57 PM Thread Starter
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I've thought about replacing the wheels and tires completely...
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post #12 of 41 (permalink) Old 12-02-2018, 06:06 PM
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I've thought about replacing the wheels and tires completely...
And if the problem is a brake drum or an axle flange your problem STILL won't be resolved...
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post #13 of 41 (permalink) Old 12-02-2018, 06:53 PM
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I was unable to solve 65mph up vibration until I put on new tires and rims even though I had the old combo checked and balanced. Given the power that you are making, a serious wheel and tire upgrade is way past due! Might want to throw a few Moser axles in as well for good measure.
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post #14 of 41 (permalink) Old 12-02-2018, 07:10 PM
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Originally Posted by Rowdy View Post
You may be right. I'm curious as to why the pinion bearing had walked.

It now also sounds like the limited slip is doing funny things.
Could be the pinion is loose, if so you'll ruin that gear set in a hurry. Do you know if you have a solid pinion spacer?

Larry
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post #15 of 41 (permalink) Old 12-02-2018, 07:29 PM
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55 to 60 MPH is classic bad tire resonant mode try swapping fronts to back etc... Good luck
I "like" this for the reason, it's quite possible the rim, in a addition to the tire, is at fault too.

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