Engine/Transmission (1998.5 - 2002) auto. transmision bucking on shifts

[Red Power Wagon]

I recently installed a v/b and t/c from suncoast. Before installed it, i had dodge check my transmission to see what shape it was in. {41000 miles} My compliant was. When it was cold , occasionally it wouldn't start out in first gear. They installed a new governor and said the transmission was in good shape. Shortly after , I received my transmission parts and had them installed. now I'm having problems on the upshift to third and fourth. When the trans. shifts at a very low rpm, going into either gear. It feels as though the trans. cant make up its mind to shift, or go back to the original gear. if i leave the throttle in the same spot , it will constantly buck in and out of gear , until i either push harder on the accelerator , or let up. I have had it scanned twice . Both places have different results. The dealer saying they found no fault codes. Has any one heard of such a problem? Suncoast said it could be a multiple of things and to get the truck scanned. I'm completely at a loss of what to do ,and I'm thinking maybe i got a bad valve-body. All help would be appreciated. . stuck in san diego. Robert