Its a 2007 silverado z71. It got in water halfway up the doors and now it want shift from 2nd to 3rd gear or 4th gear.Diagnostics show maybe transmission control or solenoids but I have no clue reverse first and second word fine but thats it what wouldit most likely be? Something inside or something electrical and what should i check first ?
I went in the water too, water went into the differential through the breather and cost me a new diff a few months later. Suggest you check
rear end oil , mind you I was submerged for a while.