It's not harmful, but it's pointless. Automatics are programmed to shift to maximize efficiency. Does it shift into 5th and 6th gear in automatic mode?
I just did this replacement, but hit the strangest issue. The screen works great in EFI firmware, but as soon as OS X starts, it goes dark. Diagnostics say "VFD003; there may be an issue with the display". I ordered a brand new display from eBay, and I wonder if they sent me the right one.
The guide itself is phenomenal, thanks for putting this together.
