Tire size... checked that first thing. The tire size is exactly what's on the door tag.
I'm getting a 25% correction factor. That is, Speedo reads 40, I'm going 50 according to the GPS.
I haven't checked the odometer yet but I'm pretty sure that it's under-registering too.
On my old '75 Chevy, I had some trouble getting the right module to correct for larger tires. In those years, it was actually a gear reduction device that has male/female speedometer cable connections. It went right onto the tailshaft of the t-case. Is that the way they still work on the '93?
I'm getting a 25% correction factor. That is, Speedo reads 40, I'm going 50 according to the GPS.
I haven't checked the odometer yet but I'm pretty sure that it's under-registering too.
On my old '75 Chevy, I had some trouble getting the right module to correct for larger tires. In those years, it was actually a gear reduction device that has male/female speedometer cable connections. It went right onto the tailshaft of the t-case. Is that the way they still work on the '93?