Shift Issues Town and Country

I am experiencing a very frustrating shift anomaly that perhaps someone can help with. 2003 T and C . Under certain throttle conditions ( usually light ) from a dead start I am feeling a bump/violent shudder between the 1-2 transmission shift. If I let off the gas, I can get the shudder to quit and then by continuing to accelerate , successfully complete the 1-2 shift. Does not happen all the time and never under straight ahead med-hard acceleration. By nature , happens most of the time under light acceleration when turning a corner from a dead stop. Sort of feels like a loss of traction or something funky happening with the torque convertor. Have serviced the trans with new fluid and filter, new TPS, new plugs, wires, and coil pack. Any help would be appreciated.

Sounds like the 1-2 shifter spool is sticking a bit.
You could try some Lucas Tx lube first.
If that does not work, you'll need to drop the Tx pan and clean out the passage that it runs in.

Mike in Colorado