You have a good point because in 3rd gear at 40mph at 1550 rpm would the drive shaft by ITSELF have enough inertia to cause the vibration? I think it's spinning 1to1? I seen everything spinning under there and I don't see any kind of wobble in the parking drum or shaft.
Drained the pan oil and it all looked clean. I taped a Q tip to a screw driver and there is a thin layer just enough to turn my finger black of black "silt" on the bottom of the pan. I looked at it with magnification and no metal is found. Not sure it's worth pulling the pan? If I pull the trans brake drum, will a tire place be able to determine if it's out of balance and remedy it?
Id say no. It's hard for us to understand how severe of a vibration you are chasing. I have a 64 with a ball and trunion setup. It had a worrisome vibration at higher speeds that turned out to be too much grease in the boot, most likely all in one side from sitting on a hot day?? All went away....id be pissed if i tore the car apart for nothing.
Thanks Lefty. I'm going to replace the oil and move backwards. The engine I've been forwards and backwards on if you see my previous posts. But if it is the engine or the transmission I think done and the next owner can deal with it. Some riders won't notice it but I can feel it in the steering wheel. I've already popped it into neutral at 40mph and it goes away so it's not the tires out of balance.
