I have one of those cross members in my truck with a SM420. Whenever I've dropped the gearbox, I've always removed that cross member first otherwise it would be in my way. The TT would be temporarily supported via different means such as a bottle jack, nylon strap from frame rail to frame rail.

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.