Vibration over 40 mph.
The patient:
74 Duster
360/A-500 (fresh rebuild)/8 1/4
TCI flex plate
Neutral balance stock truck convertor.
Slip yoke from a C body 727
New driveshaft built by a reputable shop 53.5" (high speed balanced)
1310 to 7260 conversion u joints.
The problem:
Vibration over 40 mph. Regardless of OD on or off, vibration is the same.
It rode nice and smooth last season with the A-998 but the trans shifted bad so I convinced myslf to rebuild and install an A-500. The driveshaft ended up 7" shorter. I installed the trans with the output shaft centerline at exactly the same height as the 998, just 7" back.
When I measured the driveshaft, I bottomed the slip yoke out on the transmission and pulled it back 1".
It is up on stands now and the u joints are tight. The only movement I can feel is less than a 16th" (guessing) at the slip yoke.
Below is a pic of the angle measurements I got with the Tremec App. It looks to me like these angles are too close to the same and when torque is applied causing the pinion to raise, that causes my vibration.
Am I on the right track?
Cley
The patient:
74 Duster
360/A-500 (fresh rebuild)/8 1/4
TCI flex plate
Neutral balance stock truck convertor.
Slip yoke from a C body 727
New driveshaft built by a reputable shop 53.5" (high speed balanced)
1310 to 7260 conversion u joints.
The problem:
Vibration over 40 mph. Regardless of OD on or off, vibration is the same.
It rode nice and smooth last season with the A-998 but the trans shifted bad so I convinced myslf to rebuild and install an A-500. The driveshaft ended up 7" shorter. I installed the trans with the output shaft centerline at exactly the same height as the 998, just 7" back.
When I measured the driveshaft, I bottomed the slip yoke out on the transmission and pulled it back 1".
It is up on stands now and the u joints are tight. The only movement I can feel is less than a 16th" (guessing) at the slip yoke.
Below is a pic of the angle measurements I got with the Tremec App. It looks to me like these angles are too close to the same and when torque is applied causing the pinion to raise, that causes my vibration.
Am I on the right track?
Cley