another Range Shift Inhibited

[73impala]

having a problem with this already replaced the ignition switch and NSBU switch and nothing worked. code reader is giving me P0700, P0841, P0843, and P0848. ive heard it could be a valve in the torque converter and also heard it could be a ground problem. the time that this started occurring is right after i did my body lift. so what are the grounds for the allison transmission that could cause this to happen? i have checked all the grounds that went along with the body lift and have gotten no results

thanks

 

[Zcar]

I'm having the same problem. Did you ever get it figured out? I replaced the same two things. It seemed to be fixed after I replaced the ignition switch a little less than a year ago. Went out today and it came on again, I'm ready to let the thing roll down a large hill with no end. It is about 5 degrees outside, could this have anything to do with it? Its been having signs the last couple months that something was wrong. Twice I drove to the end of my driveway and hit the gas pedal, it rev'd up then slammed into gear to pull out. But then cleared up. I'm at a loss for this truck, something breaks on it once a month.