I'be done it for a short distance before trying to narrow down a vibration. You can buy a transmission stop off tool. You basically jam this in when you remove tranny's to keep fluid from leaking out. I used mine for about 3 miles or so and it stayed in. If I was going to go longer with it, I would make sure it didn't fall out. Wire, strap sometime so it doesn't pop out.
Just like anything, you might break the it or the seal if you jam it in to far or too hard.

Blacktero: 90 Montero Lwb V6 RS Model. 16" Toyota Alloy Rims, Dual Bouncy's; Gen II Front Rotors & Calipers; Rear LSD

Sraider: 87 Raider 2.6 base. Work yet to be done.