Hey all, new member here. I picked up a clean 05 for super cheap because it's having some transmission issues, with the intent of getting it roadworthy and reselling. What appeared to have happened is the trans cooler in the radiator went (has been bypassed by previous owner) and got antifreeze in the trans. Initially the trans would only work in 1st , 2nd, and reverse and speedo didn't work as well. The speed sensors were covered in fluid from being overfilled with coolant/atf, so I cleaned the sensors, did a 3x3 fluid change so now I have good clean fluid and the trans works if I take off in 2nd then switch to drive. However, the car just sits there and revs if it tries to go into 1st in drive. The trans doesn't slip in 2nd-5th, or grind or make any whining noises and can even go into lockup after doing my initial repairs, and the drain plug didn't have any crazy metal shavings on it, so I'm thinking the car didn't get driven once it had the issue, and I might have caught it before there was any catastrophic damage done to the trans. I've read about maybe checking/replacing solenoids/valves or shift linkage? Any help on what I could check would be much appreciated, thanks!