I picked up a 61 C10 in fairly good condition. I have replaced the wheel cylinders, clutch slave cylinder and master cylinder. While under the truck, I saw the speedometer drive gear and housing were not there. The hold down bolt had been broken off in the tail shaft and the hole for the gear sealed with a freeze plug. Does anyone have a picture or know where I can get the parts I'll need? The truck has a 6 cylinder with 3 on the tree. I also noted the engine has no oil filter. Is there any way to add a filter? I haven't got to the engine yet but I can turn it over by hand. Thanks for reading my long winded post.