The Ford Barn

Daves55Sedan · 08-16-2017, 11:21 PM

Noting that this drivetrain is not original to the car, I suspect the driveshaft was either modified or a completely different driveshaft was used. It is possible that the driveshaft is shorter than it should be which means that the front yoke might not have as much meat coupled with the tailshaft. The yoke needs to slide in far enough to gain good engagement with the tailshaft splines AT THE FRONT OF THE YOKE. If it is too short, the driveshaft will slop around even if the driveshaft is properly balanced.
Notice how the pipe portion of the yoke is 5 or 6 inches long and there should only be about 1-1/2 inches at most sticking out from the back of the rear extension housing, that means the yoke would be engaged about 4-1/2 inches in the tailshaft. That would be a good assembly. Also notice that that bushing inside the tailshaft is about 2 inches long. You want the front of the yoke pushed past the front of that bushing.
This should all be checked WHILE THE REAR AXLE OF THE CAR IS IN IT'S NORMAL POSITION RELATIVE TO THE HEIGHT OF THE CAR FRAME.

08-16-2017, 11:21 PM	#4
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: Vibration Noting that this drivetrain is not original to the car, I suspect the driveshaft was either modified or a completely different driveshaft was used. It is possible that the driveshaft is shorter than it should be which means that the front yoke might not have as much meat coupled with the tailshaft. The yoke needs to slide in far enough to gain good engagement with the tailshaft splines AT THE FRONT OF THE YOKE. If it is too short, the driveshaft will slop around even if the driveshaft is properly balanced. Notice how the pipe portion of the yoke is 5 or 6 inches long and there should only be about 1-1/2 inches at most sticking out from the back of the rear extension housing, that means the yoke would be engaged about 4-1/2 inches in the tailshaft. That would be a good assembly. Also notice that that bushing inside the tailshaft is about 2 inches long. You want the front of the yoke pushed past the front of that bushing. This should all be checked WHILE THE REAR AXLE OF THE CAR IS IN IT'S NORMAL POSITION RELATIVE TO THE HEIGHT OF THE CAR FRAME.