Transmission viberation/shudder when coating

[Hunter45UT]

Need some assistance. I just rebuilt my transmission after installing I took it for a test drive I accelrated trough all gears with no problems. Once I took my foot off the throttel and started to coast the truck begins to viberat and shuter viggerusly. It felt like I was driving on a was board road. I installed a rebilt torque converted, installed the transgo tugger kit and replaced all steals and clutch plates with performance a to parts. I also had the pump rebuilt by reputable transmission shop. I used the AST mannual during the rebuild. Anyone have any idea why it I shuddering and vibrating

Chris

[retmotor]

I have no idea.

Anyone else?

[jesilvas]

JUST when coasting?