Vibrations
Hey FABO Tech, I just need some answers to what might be the issue to my driveline vibrations.
This has been a problem since I have purchased my 71 duster that was swapped with a 340 and 727TF. I get these vibrations at around 60+ MPH (it is not a wheel balance issue as I have gotten them balanced) I recently began my scavenger hunt to figure out the culprit.
Last week I put the car onto jack stands and jacked up the rear. Put it into drive and let it roll slowly. Come to find out my whole driveshaft is shaking up and down. Linked below is the video of this.
I started thinking that the driveshaft is too short (yoke is too far out for the bushing) but it seems to have enough splines grabbing (it is a 6 inch yoke that has 2 inches of no splines). I read from one member that about 1-1.5 inches of slippage is okay and won’t cause any vibrations. I’m taking my driveshaft to a driveline tech tomorrow to see if it is balanced properly.
A picture is attached below to show the measurements of the yoke. The green measurement is the measurement where the output shaft sticks out. So I measured the yoke to the end of the tail shaft housing. The red measurement is from the seal to the yoke. (Both are measured in inches)
There is also some play up and down in the tail shaft attachment point from the yoke shown in this video.
I know that there is a bushing that the yoke rides on by using the tranny fluid. And that’s what I’m leaning towards being the problem.
My question is…
Is the play because the yoke is out too much or is it from a worn bushing or is it both??
Hey FABO Tech, I just need some answers to what might be the issue to my driveline vibrations.
This has been a problem since I have purchased my 71 duster that was swapped with a 340 and 727TF. I get these vibrations at around 60+ MPH (it is not a wheel balance issue as I have gotten them balanced) I recently began my scavenger hunt to figure out the culprit.
Last week I put the car onto jack stands and jacked up the rear. Put it into drive and let it roll slowly. Come to find out my whole driveshaft is shaking up and down. Linked below is the video of this.
I started thinking that the driveshaft is too short (yoke is too far out for the bushing) but it seems to have enough splines grabbing (it is a 6 inch yoke that has 2 inches of no splines). I read from one member that about 1-1.5 inches of slippage is okay and won’t cause any vibrations. I’m taking my driveshaft to a driveline tech tomorrow to see if it is balanced properly.
A picture is attached below to show the measurements of the yoke. The green measurement is the measurement where the output shaft sticks out. So I measured the yoke to the end of the tail shaft housing. The red measurement is from the seal to the yoke. (Both are measured in inches)
There is also some play up and down in the tail shaft attachment point from the yoke shown in this video.
I know that there is a bushing that the yoke rides on by using the tranny fluid. And that’s what I’m leaning towards being the problem.
My question is…
Is the play because the yoke is out too much or is it from a worn bushing or is it both??
