I have a 1980 Dodge D-300.</P>


it has a drive line vibration......</P>


Both u-jiont's were rusted up solid so i changed them still vibrate's so i replaced the retreaded 9.50-16.5's with some 7.50-16's super traction's. still virbrated. so i changed the front wheel bearing's. still vibrate's..... i have done a complete tune up on engine including a new distributor as the ld one was bent. it still vibrate's..<IMG src=smileys/smiley19.gif border="0"><IMG src=smileys/smiley19.gif border="0">.....</P>


niw have noticed if i rev it up in nuetral or park it dose it as well so now it's narrowed down to the engine and transmission...</P>


Now i'm thinking This truck of had a 318 and the 360 was swaaped in and they put the 318's flywheel on the 360???</P>


or they put the 318's balencer on the 360?? or Both??</P>


it vibrate when you wined it up around 2,750-3250rpm's then it will go away but it dose get worse just as it shift's???</P>


you get the truck above 60MPH and it vibrate so bad and fast you can't see.........</P>


drive Line; 360 2bbl,727 auto,4.11 gear's...</P>


I was also told that the blancer might the right one but the rubber might have dryed out and crummbled apart??</P>


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Any help would be sweet.........</P>


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Check the motor mounts and transmission mounts. I had a similiar problem and it was the tranny mounts.
Hope this helps.

Brian