I ran into this also and there is very little information out there about these numbers on the ID Tag. Here is what I was able to find...
When looking at the ID tag, on the tranny, I have no information on the first row of numbers. The second row contains the model number(first 4 digits to the left) and assy number(the next six to right, ####-##). This is the number that you gave in your above post. Next is the bar code followed by one long number that is actually two numbers in one. The last four digits of this long number is the build date of the tranny. Everything before that makes up the serial number.
Sorry that I am not much help here. Only advice I have, is stay with the same build number and as close to your current build date if at all possible. Only other info I can add here is that the model number will only denote 4 and 6 cylinder models.
