knock filter is created based mainly on bore size, so try and match up the bore of the 4.0 with the closest GM application.

cylinder select code is based on a couple of pins on the MEMCAL and what's stored in the PROM as the correct combination of pins either high(5 volts) or low(0 volts). it's only 2 pins in every application i've come across that uses them, so 4 possible combinations. 00, 01, 10, 11.