I found the adjustable fingers and chains useless. Floor jacks seem to be designed for automatics with their nice flat pans. Apparently, it's just me as others think they are OK.
I would measure from the output yoke to the frame and to the cab floor. (maybe put a chalk mark to replicate the measurements). The issue is that when the transmission on the guide pins, it can still move around quite a bit making it hard to align it to the pilot bearing so it can be shoved home.
