Is there a trick in installing the manual transmission (78er Chevy C10 3 Gang Saginaw)

Hi, finally I let all the other construction sites and projects be and made me to the gearbox installation. So first the pilot bearing cooled down and then hit with a suitable nut. Then the clutch with pressure plate installed, the clutch bell unscrewed and the back bearing used. For the centering of the clutch disc was extra a splint, which I of course also used. What I failed, the transmission through the clutch disc into the Pilotla My problem is, the car is standing in the garage on its wheels and I’m lying under it. So I pushed the gearbox on my shunting car lifter into position and then pushed the last way by hand into its final position – or failed exactly there. Is there a trick in how to thread the gearbox? Btw. I had read in Tool Forum from the ks tool power joints and since when I was removed with the standard joint of the ratchet box at the a I hit the frame slipping (the finger still flings), I bought the times – good decision! If this is too much advertising, the part simply deletes. Greetings Chris