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Hey guys I want to add a vss to my ebl flash. I need a little guidance on what to get and where to get. I have a th350 with a Dana 300 transfer case so the vss will need to be inline with the speedo cable. Jags that run has one that I think will work? What the heck is DRAC and why would I need it?
I'd think you want a 2000 pulse per mile square-wave output unit. That's typically what the early TBI stuff like a '7747 needs.
The DRAC was to convert the 40 pulses per driveshaft revolution picked up from the 40-tooth reluctor ring on the tailshaft into 2000 pulses per mile by accounting for the rear gear and tire diameter. It also produced speed signals for the cruise control and the ABS. You can run a 2000 pulse per mile sensor from the speedometer cable directly without it.
Thanks for clearing that up for me.