I am in the process of fixing the hi-speed (direct drive) function in the gearbox (turns out screws and pins connecting the female clutch dog part to the input gear were sheared off). Before opening the box I removed the drain plug from the bottom but no oil came out. After disassembly I noted that the box is packed with lots of grease. From the position of the fill and level plug on the side I can see that the oil level, if used, would come to the middle of the gear reduction jack-shaft - which makes sense to lubricate the bronze bushes it spins on. I am wondering if and why Rockwell switched to packed grease lube and if it makes any sense for me to remove the grease and fill with gear oil. The condition of the gears and bushes is very good (the machine is a 1964 model and unknown earlier history so maybe didn't see much use). I have used it for a few years cutting metals and occasional wood (with the slow speed that works). But I wonder how the grease is lubricating the various bronze bushes adequately. So basically any opinions or advice on whether I should convert (back?) to oil sump lube?