Well, after 6 months of work I put the 49 on the road today and took it on its maiden voyage. It's been a fun project so far cleaning up the vehicle, replacing a lot of the wiring harness, water pump and converting it from a dump to a flatbed. The shakedown went well-I made it out and back unassisted. One thing that surpised me is the speedo. I removed the two speed mechanism on the back of the speedo (wasn't working) and connected the cable directly to the speedometer drive. Going down the road, it appears that the speedo is reading a bit slow, but the odometer is accumulating miles like crazy and recording tenths as miles or maybe even more . I have other units on the shelf, and opened one up to see what is in there. I don't see what is causing this. I'm inclined to replace the speedo, but I really don't want to as this truck was a former firetruck that obviously has low miles on it. I did check the 2 speed drive unit when I removed it and it appears that in high range that that it is very close to a 1:1 ratio, which is why I figured I'd be okay hooking the cable up to the back of the speedo. Any suggestions as to what could be causing the slow read on the speedo and the high odometer readings?