vibration after 3.23 to 3.91 swap

When I said 130 mph I was talking about the 3.23 gears. I’m still using the same speedo gear from the 3.23’s so the mph is off in the video. The vibrations start probably around 75mph and I let off probably around 90.

With the 3.23 gears it would happen at a speed that would never be reached.

I forgot about the vibration and never checked the bearings. just threw it in because my coworker has a built 86 camaro with a 406. Figured if he got cockey I’d be ready.