Got 2 SM420s im lookin at. Have pics and numbers for both. The numbers on the tranny on the left are C296 7GM 3837334, and looks like it has ribs on the side of the case. Numbers for tranny on the right are C169 4GM 591665. Trying to decipher what the years are for each. Middle pic is the tranny on the left in first pic. Im trying to get an sm420 that doesnt have the oil slinger groove, dont need oil spilling onto clutch, or anywhere else.Also a pic of gears behind PTO cover? They look okay? If one of these will work, i'll go look at them and inspect closer( rings, gears, etc), but they are 2 hours away, so id like an idea before i spend $$$ on fuel.