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Old 01-29-2012, 12:04 PM
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Bad Engine Vibration?

I finished doing a C4 to T5 conversion on my 1966 Mustang w/289 and have a problem.

There is a BAD vibration (while in neutral) & starts at around 1900 RPM & upward. No vibration at idle to 1900 RPM

It does it either with the clutch pedal depressed or not.

Also really bad vibration driving down the road & again, pass the 1900 RPM.

I didn't have this vibration with the my older C4 auto.

When I did the swap, I installed a pilot bushing (roller type), billet steel flywheel, King Cobra 11.5" PP & Disk, etc. All new parts & mounts.

Also had the drive shaft cut 3/4" & balanced.

My engine is a 289 & the new flywheel is supposed to be a 28 oz. that came in the kit.

I used the dowel pins for centering the pp & the disk alignment tool.

Torqued everything to specs.

I'm using a clutch cable setup.

Anyone have any ideas what the problem is?

I did notice the new flywheel had 2 allen head screws holding the counter weight on, & is about 3" length & 1" in wide if that helps.

I'm wondering if I received a wrong flywheel? I contacted the seller, & he told me I have the correct one.

I mail ordered the complete clutch kit as a package.

The T5 I installed was used with unknown condition.

I replaced the original harmonic balancer to see if that was the problem. NOT!!

Could the older T5 have caused this?

I've since bought a brand new Ford T5Z trans to install in placed of the older T5. But, I don't want to install this just to pull it back out if the vibration is still present.

Would it be possible that the new flywheel is out of balance?

Can a machine shop test to see if it is correctly balanced?

Again, I didn't have this problem until I put in the T5.......
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Old 01-29-2012, 01:52 PM
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To get the ball rolling...

It shouldn't be difficult to have the flywheel tested for balance factor- and you're correct the balance should be 28.2 ounces on your engine (doesn't mean that is the weight of the added balance piece, obviously). But if the 'wheel's on the engine already that's a different story . Hopefully the balance weight size you gave will mean something to a Ford guy. If you end up having the flywheel spun, take the clutch with to check it for any abnormalities in balance.

If the pilot bearing were the wrong ID, larger than the input shaft, it could cause a vibe, but I'd expect it to not be as "on and off" as you describe. But stranger things have happened; harmonics can fool even the experts sometimes. Drive shaft is out of the picture unless you're rolling so you can eliminate that.

Good luck.
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Old 01-29-2012, 04:33 PM
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Thank you for the reply.

I'll be taking this to a local machine shop tomorrow.

I wasn't sure if this could be tested or not, & I didn't want to look like the "Fool" when asking them.

Good idea about taking the whole setup there......PP, Disk & Flywheel...

The pilot bearing is the correct one. T5's for 6 cyl engine take a different size bearing. Just a little fyi.....

I'll post on what, if anything, they found.

thanks again, steve
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