Installing a TH400. I want to make absolutely sure I have the torque converter properly engaged on the tail shaft to avoid a disaster. I have specs from the internet stating after 3 distinct clicks the torque converter should be all the way into the transmission and should measure as follows "from bellhousing to converter pads = 1.187" +/- .050". I cannot find any info ANYWHERE that mentions the term "converter pads" (so typical of instructions). Is it the housing face of the converter, the flat spot the 3 nuts are welded to, the pilot nose, what?

Thanks for your help