Multiple issues after battery cables were hooked up incorrectly

Like when your transmission is going out and it shifts hard, and you hear something banging. He said something about there being too much pressure. They didn’t give me a repair estimate, they just told me what needed to be done. Which is why I’m hesitant to do it because any repair done in the transmission by anyone but them will void the warranty. Although, I’m thinking AAA frying something may have already voided it. But yes, I have to rev it for it to engage but sometimes when it does you can hear it bang when it finally engages. That’s what he meant by kickback. I wish it was 80 here lol that would be hot but more tolerable than it is here. It’s about close to 90. I’m from the beach, but I’ve been in LA county for like 5 years now and somehow am still not accustomed to the heat. It gets over 100 often. I swear I am meant for Alaska.
And thank you again.

Orange County is where I’m from! Lol Currently I live in Covina. Not far from Orange County at all. Wow you’re awesome! Lol thank you so much for helping me!

And I remember they said something about a solenoid but that it’s too hard to change a solenoid and I’d be better off changing the valve body or something like that. He said what’s going on with my car is the same thing that happens when you drive stick but shift too soon or something like that. Had something to do with a clutch.

The shop that honed my block also rebuilt my heads. My car has barely been driven since the rebuild. Am I wrong or should I not be hearing lifter tick and valves clacking? Can you hear it? There’s another noise almost like I’m low on oil but I’m not. Also, I never did figure out that hose at the end of the video lol. The machine shop told me to just use thicker oil, but I shouldn’t have to if I paid them a bunch of money to rebuild my heads right?

Also, these are the codes popping up now. I will also show the message from the place that sold me the PCM. I accidentally clicked the same picture a couple of times, but it won’t let me erase it, lol, sorry.

I fixed it! Well, I didn’t. Although I don’t understand because the problem was the fluid. I have the Ford attachment for the transmission fill or drain plug and I pumped fluid until it came back out and waited for it to be a steady stream but apparently it was low. They said something about having to put it up on a lift and putting it in drive then park so that it fills the torque converter also. Weird. But it runs now with no issues. Well, no transmission related issues. Now I’m having issues with shuddering when I accelerate but it’s probably because of my rear CV joint boot. I don’t know why but it’s spitting grease all over the place. Not sure if I need a new one. If it’s not one thing it’s the other. Also, a little confused because on two different Autel scanners I’m getting different results. The pics I sent are from one and another one has no codes pop up. Not sure what to think about that.

Thank you, I appreciate all of your help! Finally, I have my car back. I don’t even know what to do now. All I know is I want to drive lol. Just have to fix the CV joint and drop my trans to change the rear main seal because it’s leaking but after that I’m good to go! I must’ve installed the rear main wrong which sucks but seems so minor compared to everything else I’ve had to do for this car. I’m not even worried about how hard it is or anything because it’ll be a breeze compared to the hoops I’ve had to jump through once and back again to get this thing running, lol.

Spoke too soon. Turned my car on this morning to find the exact same problem. I just don’t get it. The transmission shop said from his test drive the transmission is working exactly how it’s supposed to. Obviously, it isn’t. I tried to tell him that the problem will likely come back because considering when the problem first started it has nothing to do with fluid. He just ushered me off as if I was bothering him with my questions. I was right though.

Yes, just the fluid. And yeah, same issue and yes 2wd. 2003 Ford Explorer XLT 4.0 v6 SOHC 5r55 5 speed automatic rear wheel drive to be exact, lol.

Could this be happening if I had connected up the external trans oil cooler lines backwards?

I’m not sure if it was the original and yes, it’s an auxiliary cooler that doesn’t go through the radiator.