Ridiculous vibration

Renob89gt · Apr 25, 2020

So I have tried looking around and found a few different things but nothing quiet fitting for me.

1989 mustang GT 306 w/ svo heads and xcam explorer intake. Nothing overly crazy but I have a nasty vibration coming from the trans area/shifter as my rpms go up. You can begin to feel it around 2500 but really shows at 3k. This vibration comes whether I'm sitting in garage or driving down the street, with or without the clutch in. As I've worked on fixing the car up and done thing to it to help it be reliable and smooth I've kind of chased the vibration. I feel like I've covered all the basics that I read about in other posts Everything below I've done....
FRPP aluminum drove shaft w ujoints
New 3:73 gears
New clutch w/FRPP 50oz flywheel, new hearing with it.
New FRPP 50oz balancer
New Hurst shifter
Have electric fans
New wheels and tires balanced

Appreciate any input on ideas. Just wondering if it means rebuild/ new trans. Wife will really love hearing that.

Deleted member 215073 · Apr 26, 2020

Motor mounts? Is the balancer the steel one with the removable weight or does it look like the factory one?

General karthief · Apr 26, 2020

Check the firing order, the non ho firing order will make the vibration you feel.
If the vibration is present standing still with the clutch depressed it will be engine related.

Renob89gt · Apr 26, 2020

JMGlasgow said:
Motor mounts? Is the balancer the steel one with the removable weight or does it look like the factory one?

Motormounts are new, and so are trans mounts. Forgot to mention that

Renob89gt · Apr 26, 2020

Renob89gt said:
Motormounts are new, and so are trans mounts. Forgot to mention that

Balancer was the same as factory

Renob89gt · Apr 26, 2020

General karthief said:
Check the firing order, the non ho firing order will make the vibration you feel.
If the vibration is present standing still with the clutch depressed it will be engine related.

I'll double check the firing order today. Would this not make the car run rough? Seems to run and start well.

General karthief · Apr 26, 2020

Renob89gt said:
I'll double check the firing order today. Would this not make the car run rough? Seems to run and start well.

It will run fine just down on power and a nasty vibration

Renob89gt · Apr 26, 2020

General karthief said:
It will run fine just down on power and a nasty vibration

Firing order is good to go. It certainly doesn't feel down on power. Runs good other than this dang vibration. Lol all new plugs, cap and wires as well.

General karthief · Apr 26, 2020

You are using the HO firing order right?

Rdub6 · Apr 26, 2020

I had a fan clutch go bad on my first fox years ago. Caused a real bad vibration that took me a while to track down also!
One day I happened to spin the fan by hand and saw it wobble. Changed the fan clutch.... no more vibration.
Worth a look.

Deleted member 215073 · Apr 26, 2020

He stated the fans are electric

Rdub6 · Apr 26, 2020

I guess it’s not the fan clutch.

Renob89gt · Apr 26, 2020

General karthief said:
You are using the HO firing order right?

Yes. Got the correct ho order

General karthief · Apr 26, 2020

It's only a guess but it's possible there is something amiss with the clutch/flywheel, hard to say without putting hands on it. Pilot bearing maybe, imput shaft in the trans, like I said hard to say.
If the pulleys are good, no balancer wobble, no engine miss that's the next logical area.

deathb4dismount · Apr 27, 2020

Was this vibration present before the xcam?

Renob89gt · Apr 27, 2020

deathb4dismount said:
Was this vibration present before the xcam?

Cam was done by previous owner.

Renob89gt · Apr 27, 2020

General karthief said:
It's only a guess but it's possible there is something amiss with the clutch/flywheel, hard to say without putting hands on it. Pilot bearing maybe, imput shaft in the trans, like I said hard to say.
If the pulleys are good, no balancer wobble, no engine miss that's the next logical area.

By chance would rockers/lifters cause a vibration like that. I was under there today and it sounded to me like there may be some tapping going on. Not 100% sure as I'm not a great mechanic but could it be a cause?

General karthief · Apr 27, 2020

Run a compression test, a dead hole will make it vibrate.
Well, more of a shake.

Exrace89GT · Apr 27, 2020

Take the fan belt off and run it for a few minutes. That eliminates any of the engine driven accessories.

LX1993 · May 4, 2020

If you're sure it's confined to shifter/trans, it sure sounds like a throw-out bearing. Preload should be 5-7#.

Ridiculous vibration

Renob89gt

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Deleted member 215073

General karthief

wonder how much it would cost to ship you a pair

Renob89gt

Member

Renob89gt

Member

Renob89gt

Member

General karthief

wonder how much it would cost to ship you a pair

Renob89gt

Member

General karthief

wonder how much it would cost to ship you a pair

Rdub6

So while I wait to figure out my rear end issues

Deleted member 215073

Rdub6

So while I wait to figure out my rear end issues

Renob89gt

Member

General karthief

wonder how much it would cost to ship you a pair

deathb4dismount

Crap, didn’t realize my crotch was in that picture

Renob89gt

Member

Renob89gt

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General karthief

wonder how much it would cost to ship you a pair

Exrace89GT

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LX1993

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So while I wait to figure out my rear end issues

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wonder how much it would cost to ship you a pair

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