Good vibrations?

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Pentarockstar

Pentarockstar

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Howdy Mopar nuts,

Got a 69 dart swinger with 340 and 4-speed. Been having some bad vibrations during acceleration above 3,000 RPM. It gets worse as the engine RPMs go up. Had the driveshaft balanced, made a little difference. I am thinking something is bent in the transmission.

Any help is good help! Thanks
 
What has changed in the rotating assy?

Does it vibrates in neutral at same RPM
 
I had a new crank put in a few years back, because the thrust was way out of line. But it did vibrate back then. When i look back, I put another transmission in when the vibration started.

I have not tried to "free" rev the engine in neutral. This would separate engine and transmission problems.

BTW I used to live in FT. Collins back in the 90's
 
Small world.

I would do a neutral and a clutch in test. To rule out transmission.
 
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