I found several threads on this and have a question on some items I can check myself. First off, I do not have any codes and the live running diagnostics show everything as ok. The issue is, in the morning, I do not even notice an issue, however after driving for about 30+ minutes on the highway, when I get on a road where 1-2 & 3 gears get used the most, I start to notice hard shifting. I tend to notice it during lunch or on my way home right away before I get on the highway but never in the morning when I start the car after 12 or so hours of it being off. It appears something is either jacked up with the trans and I am beginning to notice it, or perhaps something electrical?
I was going to check some obvious things first that I saw in the threads below:
My question is (and as silly as it may be), SHOULD I unhook the battery to perform these operations? Or is it perfectly safe to remove the ground to clean it off while the battery is still connected? I do not want to accidently fry any sensors or electronics in the vehicle.
I assume it is safe to pull the TCM fuse at least while the battery is connected to check for corrosion? Clearly, I intend to have the vehicle OFF while performing these tasks.
That's all for now. If anyone else has advise on other things I can check without having to have someone dig into the trans please let me know. I have maintained all maintenance to the mile (+/- 5K on major services) and have 129K miles currently. I got the vehicle brand new in 06' (I have an 07' model). I had a 2nd trans filter & flush about 10000 miles ago so I should still be good there. I have replaced the fuel filter, cleaned TB, new plugs, clean filters, clean MAF and the car itself idles VERY smooth.