4l60e 2-3 slipping shift

[Deuce]

Maybe it might be better shifting the shifter manually through all gears to try eliminating the faults like you say Deuce?

But it will still shift when the numbers are met in the tune even tho shifting manually, is that right?

Yeah. There are 'abuse' settings that will upshift irrespective of shifter position. So set those high.
But otherwise you are basically commanding max gear available.
I'll select '3' above 5000 somewhere, and all let the tune shift it at the correct road speed (which is hopefully finished with a max engine rpm around 6200)

[vscapricetim]

So basically, your shifting 2nd and 3rd manually but trying to shift a little early to let the ecu shift it. In the hope it pushes through the faults?

[Deuce]

So basically, your shifting 2nd and 3rd manually but trying to shift a little early to let the ecu shift it. In the hope it pushes through the faults?

Yes, exactly that.

[vscapricetim]

Ill keep that in mind. Worth a shot....