Driveline vibration

[Royce]

I might spring for this ... Neat app...You could burn up 400 bucks at a shop pretty fast.

https://www.youtube.com/watch?v=GuI0hH2TuxQ][url]https://www.youtube.com/watch?v=GuI0hH2TuxQ[/url]

[wayne]

I put a pinon seal in and got a vibration i could not find a friend that worked for ford told me.Told me to take the drive shaft out and give it one half turn and bolt it back up it fixed it but i have no idea how.

[Royce]

angle at trans yoke is -1  driveshaft -5   pinion yoke -2  looks close enough not to be the root cause...  I may just throw in another set of U joints.. Engine is smooth up to 3000 rpm so I am inclined to eliminate that.. The frequency of the vibration steers me away from tires and wheels

[57 lima bean]

Who's converter? And have you done a coast test from 80mph?

[338Raptor]

Under load your pinion lifts changing your angle. If you have loose suspension bushings or weak leaf springs or a missing pinion snubber your pinion angle will change several degrees under load. You can’t measure this when the vehicle is parked.

[C8OZ]

A loose/broken transmission mount can do the same and often looks fine until you pry up on it.

[Joe-JDC]

Have someone help you put the rear axel of the car on jack stands just off the ground, and put the car in gear and accelerate through the gears while you watch for vibration in trans, drive shaft, rear end, tires.  The person in the driver's seat needs to be ready with brakes if the wheels and tires start to cause a bad vibration.  Will show if shock is bad, spring is broken, wheel bent, tire out of round, driveshaft out of phase, etc.  Easy to do, and should point you to the culprit fairly quickly.  Joe-JDC

[WConley]

Have someone help you put the rear axel of the car on jack stands just off the ground, and put the car in gear and accelerate through the gears while you watch for vibration in trans, drive shaft, rear end, tires.  The person in the driver's seat needs to be ready with brakes if the wheels and tires start to cause a bad vibration.  Will show if shock is bad, spring is broken, wheel bent, tire out of round, driveshaft out of phase, etc.  Easy to do, and should point you to the culprit fairly quickly.  Joe-JDC

+1   This works!  Use heavy jack stands and block the front wheels on both sides.  For extra insurance I will put a wheeled hydraulic floor jack up solidly on the rear axle pumpkin. 

I have had plenty of success with this approach.

[machoneman]

Hey! That's what is said at the start of this thread! LOL!

[Royce]

It appears to be engine related...It became more noticeable when I went from 2.91 to 3.20 gears.  As soon as you hit 31 or 3200 rpm things start to vibrate. I gotta check all the belts and bearings up front, but that new torque converter is laughing at me. Pulling the tranny  UGH. Don't have a lift    double UGH

[machoneman]

Btw, for safety if you do block it up, once you spin the drivetrain and check the wheels/tires, remove same. Car can't go anywhere now can it.

[C6AE]

Just take all the belts off the front and try it without them?

[Joe-JDC]

Check your motor mounts for two or three bolts.  Check block for two or three bolt holes.  Is there a possibility you have a later shortblock such as a 410, or 428 PI?  Then the original flywheel would be out of balance.  I know you pulled the engine for detailing, but did you think to check for motor mount holes?  Just an idea.  Joe-JDC

[winr1]

Link to app


https://www.youtube.com/watch?v=GuI0hH2TuxQ



Ricky.

[Joe-JDC]

Link to app


https://www.youtube.com/watch?v=GuI0hH2TuxQ



Ricky.

Wow!  I was stationed at Hill AFB in Ogden UT when I returned from Vietnam, and I attended Weber State College at nights working on my Bachelors Degree.  Brings back some good memories of studies there.  Joe-JDC