340 -727 -3000 stall- Vibration under load - Trying to find source

Jadaharabi said

.
I am disagreeing with your logic on the slipping it into neutral at the vibration speed. That would not eliminate the drive shaft that would eliminate the engine and transmission because your drive shaft and everything behind it is still spinning at the constant speed and your engine RPM would have dropped off. I may be wrong on that logic but I highly value my opinion. Lol

Click to expand...

think you’re looking at this wrong. Picture this. You’re Travelling 60 mph, revving 3000 rpm it vibrates. Click to neutral vibrations drop as it goes to 1000rpm but the car is still travelling 60 mph. Which means the drive shaft is still going 60 mph too. If the driveshaft was the source of the problem it would still be vibrating.

to me this says the source of the vibration is motor or trans. It was vibrating at 60mph at 3000 rpm but has almost instantly gone away when revs dropped to 1000 in neutral and the driveshaft still spinning at 60mph rate.