DRAC/VSSB calibration

[beretta3400]

Hello everyone, I have a 1987 Pontiac Bonneville that I swapped a 4t65-e into. I am controlling the trans via a 16147609 TCM.

I'm looking for some insight into using a DRAC/VSSB to convert the VSS signals to the correct ratio so my ECM, cruise and speedometer all work properly. Correct my calculations as needed please!

I'm using the following formula: Input Ratio=(63360 x axle ratio x VSS pulse per rev) / (rolling circumference x 128000). Since the 4t65-e has a 30 pulse per revolution VSS signal and no axle ratio to worry about, the equation becomes (63360 x 30) / (79.5979 x 128000) which equals a .18656271083 divide ratio.

I'm not sure if this is correct and I cannot find a jumper setting to make the VSSB achieve this ratio.

Help please!