I own a 1958 Cadillac de ville here in New Zealand and I have a problem with a vibration stationery at around 2000 rpm in neutral. It seems to be coming from the bell housing area. I have checked the harmonic balancer and found no problem there. Do these jetaway trans have a problem and is there any easy fix. I would be open to any suggestions as it is quite bad at about 50mph. Cheers.

 

PM adams apple he may know

 

Holy Cow that's an oldie!
The converter can certainly cause a vibration like that. Iirc, those are bolted together, and have to be un-bolted to remove it from the trans. There may be an internal component that is worn/damaged causing the vibration. Has there been any work done on this thing lately?
I may have a manual on that thing here somewhere....I'd have to dig for it, but if I have it, I'll see if I can get some info to you.

 

Thanks for the reply. The trans was supposedly done in Texas before I bought the car. Since posting this thread I have found the rear trans mount is pretty solid. I have ordered a mount from USA and Ill give that a try when it gets here. Cheers Rick.

 

A bad mount can certainly cause the driveline to be out of alignment, and create a vibration. Hope that's all it is! Quick fix!!