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I finally made some progress with this issue. Even though the drive shaft was balanced twice, I decided to try and balance it myself. I installed a hose clamp in 12 different positions on the shaft and ran it up to speed. I found one spot where the added weight reduced my vibration. Im not sure...

Well I'm still trying to figure this out if anyone has anymore ideas. I had a new driveshaft made with 1330 ujoints, new slip yoke and new rear input yoke. I tried shimming the pinion down and up 2 degrees. I even tried shimming the trans up to change the ujoint angle. I replaced the engine...

I called the shop that balanced the shaft for me and they said they only spun the shaft to 2500rpm. I took the shaft back and had them balance it again, but this time I specified that they spin the shaft over 3000 rpm. the guy tried to balanced it again, then called me when he was done. he said...

I didn't think about 3rd being direct, that's a good point. I have ran the car on stands in 3rd and the vibration moves to approx. 3500rpm. which still comes out to be about 75mph. If it is the driveshaft, I'm not sure what it could be. I've tried balance and angle changes. Ive checked the run...

I was reading through AJ's suggestions. particularly (C). those are some things I haven't really tried. the vibration happens from 75 to 90 mph (2500 to 3000 rpm in OD). so I was thinking I would take it up to 90, then put in neutral. I figure if the vibration is still there it has to be after...

I checked drive line runout in 3 places to verify it was not bent. All of my measurements were less then .020. I also checked it at the tail shaft right at the seal. I figured that was good way to verify the main shaft wasn't bent. I tried adding a clamp to the drive shaft to check the balance...

I have a vibration from 2500 to 3000 rpm (engine speed) in 4th gear. I cant figure it out. I have tried everything. I replaced the u-joints, slip yoke, and rebuilt the trans with new bearings and output bushing. swapped in a different rear end. tried changing the u-joint angles. had the drive...