2005 Mazda 6, No start, stuck in 3rd gear

Bought a 2005 Mazda 6 2.3l back in July of 2024, drive it for a week or 2 then the AT light started coming on, and every time it came on, would be around 4th gear then she would fall on her face.. eventually she wouldn't even go into 4th gear, changes the speed sensor, changed the TCM, while this was happening the alternator went out, I went to the pick n pull and got one.. put it in, she went can to cranking up and still doing the same thing as far as the transmission issue... Then several weeks later she gets stuck into 3rd gear, I still would drive it in 3rd gear... Then all of a sudden all of my gages went out, and windows wouldn't go up or down. The horn works and the wipers.. she broke down about 3 weeks ago and come to find out 1 of the coils were bad, so I changed all 4 of them and new spark plugs, she drove fine but still in 3rd, while no gages worked... 3 days later my radiator cracked, while checking where the crack was I rode to my mom's and left the hood up, well it rained real bad, yes the plugs and coils were tightened but good was still up nonetheless, well she quit cranking, also the sensor on the transmission is loose and pouring transmission fluid, I knew the connector on the transmission was loose and moving about 7 months ago but not as bad as it is now.... I've also had to tap the starter a couple of times to get her to start while the last situations were occuring... So I got a new starter, but I've check it by doing the 12 volts from underneath and when I did that she spins... Codes say that lost communication with TCM and instrument cluster