Thanks Rick,
I got my driveshaft back in 5 hours from Driveline Specialties in Sacramento. Amazing, they squared up the yoke, replaced the driveshaft end that the yoke mates with, replaced the u-joints painted it and balanced it for $104.
The bad news is I still have the vibration. I suspect it is all in the pinion and tailshaft angles. 3 degrees is said to be the maximum for such a short shaft, including any for offset. I'm probably closer to 5 with the elevation (up/down) and offset (left right).
I have My tailshaft is pretty much dead center between the frame rails My pinion axis is more like 1.5" to the passenger side, as measured between the frame rails it's 8 3/8" off the passengers side tube and 9 7/8" off the drivers. The Contemporary differential is intergral with the frame at that point and has no real provision for adjustment there.
I may need to bring the tranny over to get a net offset of closer to 5/8" total. I also noticed the headers seem lower in front than when the 428 was in place I think raising the front of the engine, while lowering the back of the transmission is next to bring the 5 degrees closer to 2 or 3 total...
No... I didn't use the 428 flywheel
