When i took the truck for a drive, it was shifing funny. Floor it and it revs high and slowly picks up speed. It acts like it doesnt know what gear to be in. The speedo is also jumping around and will not tell me the speed i am traveling. The motor is the I6 with the E4OD behind it.

I ran the codes and got a 452 in the CM. This states
Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles.

The guy said that he replaced the VSS in the dif. I do not know what or where the PSOM is or if it is the same as the VSS.

Could that be my whole problem here?