Vibration issues

I did not have a vibration before I changed gears. I also had put new rear shocks and leaf springs. Brand new axles and it has a new rear disc conversion i drove it around like that for a few months couple 100 miles no vibration. I wanted a different gear ratio i bought a ring and pinion and built the 3.73s then the vibration started.
No I have not ran the car on Jack's
Wheels and tires are new and balanced nothing said by the shop about hard to balance.
Have not ran the car at rpm when not in gear.
I looked at the axles after I lost the drive shaft didnt see and signs of damage. I will take another closer look at them.
I have not proven it's not the transmission ( would that involve run it in gear without the driveshaft in it?)
I have not changed pinion angle (why I said I was going to check my angles because I have not done that on the car yet since I've owned it)
I just looked at the engine and transmission mounts and made sure they were good and tight engine is a solid mount and trans mount is brand new.
So I'm thinking when I lost the drive shaft I could have damaged the output shaft. Why it still vibrates when I went back to the gears I did not have a problem with.
And a slip yoke that engages the splines more. I have seen it recommends 1-1.50 inches of slip yoke exposed. I have about 2 inches now. (I understand with the output shaft damaged it would still vibrate with that change. Hence why check the trans first)
The only thing different from before I had a vibration and now aside from the new driveshaft is I went from 14 inch wheels to 15inch wheels on the front of the car. I have not changed anything else and change was the differential then the vibration started.