5R issue?

[powerstrokelover]

Changed fluid and in line filter today. Tranny has a "slip" feel from 2nd-3rd. I recently read where people were saying if their batteries died they had a similar problem. This is also my case. Alternator went out and batteries dead. Replaced alternator but not batteries and at random the truck might be dead. Read that once alternator and batteries are replaced the TCM may need to "relearn" the shift sequence. Anyone have any kind of truth or input to this? Also would the batteries being weak affect my FICM therefore affecting MPG?

[04cr450]

Yes the truck has to relarn for sure. Could take about 50 miles or so, every truck is different. Your ficm can also be damaged as well. Need to put fresh batteries in there and test ficm- if ficm is below 45 volts, replace it asap. If ficm is above 45- dont worry and let the truck do its thing. You need to have a monitor on the truck(edge cs or cts)