this one go ka_boom its old

Yes, that's a differential. It's posted on my workshop here: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1548603739

Is that a differential on the back axel?

I've been trying for so long to make a working one of those.

On the blueprint, there are two blocks from the bombard cannon mod, the jacks, that are just placed on the body of it. They're unneccessary enough that I did not include them in the required items. You can get the mod, if you want, and it will no longer say that. You don't need to, though, it will be fine without them.

Strange, I have mods in my world: Water, Ballons, Steam Engines, Sittable Chairs, Rails Modpack, Timber Arches, Diagonal Timbers 1x1 to 10x10, Gears Remade but when I paste blueprint, game say I have no mods for some blocks, what else should I have?

Deleted my last comment, I get what I did. I somehow forgot to include the water mod!

So these "controllable drums" Don't seem to exist, iv got all 3 of the required mods, but don't seem to have those for the steering. and nothing i try made it possible to steer it. other than that issue im having beautiful work

Gears Remade, Steam Engines, and Timber Arches. They're in the required items list. The bombard cannon mod is also suggested, for its jacks.

What are the mods used for this build?