cowmoo

Shifting between 2nd and 3rd engine revs like it in nuetral.I have to put it in neutral then back in gear and it'll shift fine into gear.Also when it shifts into overdrive after 2seconds of being in OD the RPM will rev way up like its not in gear.Once I put it in neutral then back into gear it'll shift fine and stay in OD.I just had a new computer put in it and this started a week after.I don't think that has any think to do with it.it is pulling any codes for tranny.Please help.The fluid is full.I'm gonna change the filter and fluid and put some Lucas in it and see if that helps.someone told me that I should change my psom (gage cluster) Which I need to anyway because oil press temp gages and odometer doesn't work.I just didn't think that would have much to do with the tranny shifting