Hi guys. I have a 1993 GMC TopKick C6000 with a 366 gasoline engine. It was a low-pro truck with the 19.5" wheels, and I not only put 22.5" wheels on it, but I changed the rear gears from 4.63 to 3.36. Needless to say, the speedometer is way off. Now I understand the "conventional" older vssb/drac where you replace the jumpers with dip switches, but this vssb/drac is completely different. The harness connector is different and there are no jumpers. It looks like it's just a bunch of resistors. Im not seeing any way to access it through the computer, and Im told that this is a heavy duty (c4000 and up) vssb. I've done quite a bit of homework on this topic and cant seem to find much at all. Any help would be greatly appreciated. Thank you.
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