Rwalen2

I got no code from the ecu or the magic hand shake. This car sat for about two years with a harmonic balancer key way issue. I pulled the engine and went through it fixed the crank got a new balancer and now it runs good but the trans wants to ( pop in and out of gear forward or reverse ) . Its like the drive differential can't decide to freewheel or go. It will go in the neighborhood but its very jerky.

I have tried using my obd2 scanner and got nothing. And I tried the secret hand shake and got the 2 flashes per second on the at temp light.

I have a automatic that pops in and out of gear in forward or reverse with a sharp jerk. Is there a solenoid or something that controls this?