2000 V6 Mustang vibration problems

[D. Dueno]

I just got a used 2000 Mustang, on the test drive it was just fine. But when I was driving it around it was shaking. It is automatic. I did get new rims and tires witch was balanced, it doesn't feel like it needs an alimight, it does pull when braking. The engine mounts seem fine, the engine dose move a little when reved. This starts around 25 MPH but it not that nitsuble. when I get up to 35 then you can notious it. at 45-60 it feels like it's going to fall apart. But this only happens when im on the gas, if im just costing it feels like a normal car. The front suspension needs some work, when i put white on it is like a trampoline, the back is fine. I put it up on jacks and there was some water in the exhaust, I dont know if that helps at all. Anything will help. Thanks

 

[fasterthanyou]

Sounds exactly like a tire that is out of balance. Or maybe a tire that has tread seperation (coming apart).

If its not the tires then its the driveshaft u-joints.

But yeah, my money is on tire imbalance.

 

[D. Dueno]

I had all the tires balanced. Is there any way to check if it is the driveshaft u-joints?

 

[HumanSVD]

I had all the tires balanced. Is there any way to check if it is the driveshaft u-joints?

Take it to another tire shop and have them check. If it checks, go get a pro to check drive shaft U joints.

 

[fasterthanyou]

Grab the driveshaft near the joints and give it a firm twist/wiggle. See if there is any movement. There should be no movement. Although that doesn't mean they are fine.
They could be binding up. Unbolt the driveshaft. Its four 12mm 12 point bolts. Take the driveshaft off and see if the joints pivot/swivel freely. If they don't you need new joints. If they move freely then your vibration is caused by something else.

 

[D. Dueno]

Grab the driveshaft near the joints and give it a firm twist/wiggle. See if there is any movement. There should be no movement. Although that doesn't mean they are fine.
They could be binding up. Unbolt the driveshaft. Its four 12mm 12 point bolts. Take the driveshaft off and see if the joints pivot/swivel freely. If they don't you need new joints. If they move freely then your vibration is caused by something else.

Thanks for that. But it was fine. The breaks do pull to the right when I break so i'm going to bleed them. I did knowtes the antifreeze needed change so i'm going to do that and take a look at the spark plugs. Any more sugenous will help a lot. Thanks

 

[fasterthanyou]

Not sure what else to tell you dude. A vibration that gets worse as vehicle speed increases is either tires or u-joints.

If it was suspension related you would have more problems than just vibration. You would have erratic steering and loud clunks every time you hit a bump or turned the steering wheel.

 

[D. Dueno]

Not sure what else to tell you dude. A vibration that gets worse as vehicle speed increases is either tires or u-joints.

If it was suspension related you would have more problems than just vibration. You would have erratic steering and loud clunks every time you hit a bump or turned the steering wheel.

Yeah I think it is the suspension. Thanks for the help

 

[John D. Carter]

If the car's original engine mounts or transmission mounts were replaced by cheap Chinese made aftermarket mounts, this could be the source of your problems.

 

[fasterthanyou]

Yeah I think it is the suspension. Thanks for the help

Lol okay then why post for help on a forum?

 

[D. Dueno]

Lol okay then why post for help on a forum?

Becuse im new to having mussicle cars and I cound not find how to do some things

 

[fasterthanyou]

That's why I posted my responses, to try and help guide you in the right direction to accurately diagnose what is causing your vibration.
I'm a mechanic by trade and work on cars as a hobby. I'm not perfect but I know what I'm talking about (for the most part). I told you reasons why it isn't your suspension, and you followed it up with "i think its the suspension." I literally chuckled and said whatever man.

Im interested in what the result ends up being tho. Take it easy dude.

 

[HumanSVD]

Becuse im new to having mussicle cars and I cound not find how to do some things

Did you figure out what was the issue?

 

[Pete fender]

Sounds exactly like a tire that is out of balance. Or maybe a tire that has tread seperation (coming apart).

If its not the tires then its the driveshaft u-joints.

But yeah, my money is on tire imbalance.

The transmission mount is famous for causing vibrations.
Get the rubber one, if yours is broken, the urethane ones vibrate on the street.
Shuddering torque converter is easily fixed with an anti-shuddering vale from Sunnex.

 

[Pete fender]

Then, there is a possibility that the balance ring on the harmonic balancer has slipped.
Early 2000 Mustangs and before, are balanced externally, and the ring has a counterweight cast in.
I tried to find the hub-ring assembly, which is pressed together with an elastomer buffer, but can only find the complete assembly for $200-$400.
Pictured below is the 99-2000 mustang v6 balancer, the elastomer adhesive ring is the thin dark line separating the ring from the center of the hub.
Also note the balancing weight cast onto the ring. (There is a step near the bottom in the picture.)
Over time, the elastomer ring gets degraded, and shifting into the gears makes the weighted ring slip a bit.
Some get so bad, they come off and cause damage.