Just be careful when you get to it that you don't snap the plumbing firther back and hafta make an even bigger plumbing fix than necessary. Also, there will likely be water in at least the trap but not enough to do any damage

To make sure I understand correctly, even if I plan to replace the drain with something like this:

https://www.homedepot.com/p/KOHLER-Clearflo-Cable-Bath-Drain-in-Polished-Chrome-K-7213-CP/100548753

The danger is that while the old drain is all attached, the sledgehammer hits may transfer some energy to the pipe that drain is connected to and damage it?

Exactly. The pipe is kind of recessed in the floor. Damage it, and the job becomes much larger. Best bet is to remove the drain beforehand.

Ooooookay. Here is the scoop you absolutely must remove/disconnect the drain assembly before you smash away at the tub. It it’s contributing substantial staying power to the tub being in THAT spot. Cut with a sawzall and proceed forth.

I see, I was hoping I could leave it because as I understand it if I can’t remove it from the top, the only other option is cutting it out from underneath - which would involve a long uncomfortable journey through a crawl space. But from what you’re saying it sounds like by not disconnecting it I run the risk of much more involved repairs needing to be done in that same crawlspace. So it’s either go under now for a fairly easy removal, or take a gamble on doing a big job down there. 🤔

If you have access to a crawl space, I would highly recommend you go under the house and cut it out if you don't want to remove it from the top.

I have seen some people cut grooves in the drain and use a couple of screwdrivers to remove it, but it is still a massive pain without the right tool. If I were you, I'd just cut it and plan to use a connector and just run a new drain.

I’ll try this tool: https://www.homedepot.com/p/Husky-Tub-Drain-Removal-Tool-410-075-0111/311493720

And if that doesn’t work I really have no choice but removing it from below right?

Yeah, it's worth a shot. Depending on how old the tub is, it can be a lot harder than what the video depicts. You might need to spray some lube on it and let it set up for a bit.

If don't remove it plumbing will break and then you have to redo plumbing, plummer's ain't cheap ,Lowes sells a socket.or called extractor. that removes tub drain shoe for about 19.00 trust me I us e it at work a lot.

Yep.

IANAP, but if you post pictures of the drain, you might get pointers for removing it.

Worst case you can use inside pipe cutters or a Dremel to disconnect the drain before going Hulk on the tub.

I just posted a picture of it

I know this wasn't your question but I had success cutting an old bathtub into large sections w an angle grinder. Loud and dusty but made for a QUICK demo.. also no flying shards from sledgehammering. You'll definitely still need to address the plumbing first though. Good luck!

What kind of pipes? Plastic drain pipe, I'd be careful but just smash it as it sits.

If you have metal drain pipes, I'd pause and do what ever it takes to disconnect.

Oh - and the only critical tip I can share, throw down a tarp or old blanket and only smash the completely covered tub. The email splintera and shatters in crazy directions, from everywhere. It's an absolute pain in the ass. ....but covering it while smashing all but eliminates the blast radius.

Funny story... I used a sledge to break out my old tub. The sledge bounced off the tub and into the toilet and broke the bowl in half. The good news is that the toilet was getting replaced anyway. The bad news is that there was water in the bowl.

I literally just used one of these a week or two ago for a very similar situation. Not replacing the tub, but had a nasty, leaky seal (in a 2nd floor, no less). Worked like a charm. Old guy a lowes told me to 'hit it real soft with a rubber mallet and use a long breaker bar with a torque adapter so you don't break the pipe'. Might not be necessary to 'not break the pipe' in your case, but in case someone else comes across this post in the future - if your crossbeams are broken, buy a crossthreaded remover like above. Works great!

Thanks everyone for your advice. I bought the removal tool but it wouldn’t go deeper than about 1/4” - so applying turning pressure would just make it slip out. I ended up cutting a few notches into it with an angle grinder and then using a hammer and chisel to turn it, finally got it:

https://i.imgur.com/joV4dBp.jpg

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Just wanted to thank everyone again for their help. With the drain removed I made quick work of the tub - smashed it to bits and didn’t damage anything I wasn’t supposed to.

Welp you gonna have to replace the drain anyway so go ahead