Originally Posted by
tayto
so here's the difference. if you are using the speed sensor from the 91-93 b-body (yellow box) it needs a 4000 PPM AC signal. this setup uses speedometer gears still with a speed sensor. it will not work with the truck DRAC (white box). The truck DRAC requires a 40 pulse per revolution AC signal. this setup uses a 40 tooth reluctor wheel like the 4L60E. You can use either system in your 700R4. I like the later myself. Either way you need to use the correct buffer for your speed sensor.
I like the DRAC setup because you can make changes in the DRAC for gear ratio, tire size, etc. With the yellow box VSSB you have to change speedo gears in the tail shaft. The ECM needs VSS input for stuff like lockup (VERY important for the 700R4)
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