No, the oil will pour out the rear of the transmission if no drive shaft is installed when it's tilted up. I would loosen the plugs on the tranny and fill it once it's in the car. They make little hand pumps that make this really easy

OK, I have rubber caps, like those that protect the threaded ends of pipes, that I can clamp onto the tranny tail prior to installation.

Lookin' good!

I wouldn’t advise filling the trans before installation. Plenty of opportunity to do that while putting the cross member and shaft in.

I was going to comment this as well. Aside from leakage out the rear ( 🫤 ), the level/angle of the unit may result in over/under fill. My 2-cents.

I bought a hand-operated transfer pump so I shouldn't have any trouble putting in the 1.5 L of Redline MT-90 when the engine and tranny assembly is firmly bolted into the chassis.

Thanks, all, for the warning about tranny tail leakage as it's not mentioned in the FSM that I have.

I was only reminded because I've drenched a rain coat in 90 weight waaaay back when I was helping a friend replace the clutch in his Firebird. We had the front end lifted and it started pouring out as soon as I pulled the driveshaft. He decided that I might not know what I was doing, whaich was partially true, and took it home after I put it back together. Good times man, good times...