Torque Converter Shudder??

[TLH101]

I have a '63 Dodge 330 with a push button 727 transmission. I have recently notice some slight vibrations between 10-20 mph when accelerating. Only happens when the trans is warm, and not always.
I recently changed out the fluid and filter. I refilled with Valvoline DEX/MERC, which states for Dexron III. The shudder/vibrations started a couple hundred miles after the fluid change.
Could this be torque converter shudder, and what is the best way to go about curing the issue?

 

[69 Sleeper Bee]

First thing I would check is U joints or motor / transmission mounts and make sure before you get into torque converter.
P.S. Awesome wagon by the way

 

[Slap Stick]

Change fluid to ATF +4.

 

[khryslerkid]

Or type F

 

[383man]

Generally non lock-up converters dont cause a shutter. Now lock-up converters can and have as they have a clutch in them and it can feel like a clutch vibration. I am guessing you dont have a newer lock-up trans in your car ?? Make sure also its not an ign miss at times. Ron

 

[66 Sat]

Throw in a tube of Anti-Shudder - probably about $20 from the local parts store. One of my mates reckons the auto trans shops use heaps of the stuff.

It's not going to hurt anything if it doesn't fix the issue.

 

[MoparLeo]

Completely drain and refill with ATF+4 . Are you telling the whole story though? Original, unrebuilt trans ?