i have a 1998 ford f150 2 wd with a 4r70w trans.had the trans completely rebuilt.after install it keeps throwing shift solenoids a and b codes.i have changed the solenoids and plastic wire harness twice,outside wire harness once.the connector that goes thru the trans on passenger side test good.any ideals would greatly help.

 

I would take it back to the rebuilder for a checkup unless you bought it from a far away place.