1970 Dodge Dart with vibration under load

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DGE7070

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I have a vibration problem with my 1970 Dodge Dart when it is under load. There is no vibration when I am driving and put it in neutral. It has a new rebuilt motor and transmission. The steering is all new as well as the new brakes and bearings. I have had the car aligned and tires balanced but still have the vibration. Does anyone have any advice or ideas what this could be?
 
Is the car timed right? Are you using a high enough Octane?
 
engine mounts, trans mount , loose mount bolts, u-joints , exhaust pipe , loose pipe hanger..
 
engine is a 416 stroker timed right motor built for 93 oct mounts new but did cut trans mount to fit but cant see how that could move it was a tall mount i probably will by short mount thanks
 
Check U-Joints for wear or not seated when installed. also pinion angle, loose U-bolts, anything that can cause a shift when under torque load. possible your trans mount loose or shifting out of position.
 
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