yo G if you check the speedex drivetrain info on the speedex site the s18 had a 2 speed some with variable speed but they had a clutch idler not a slider like the 17's and 14's this tractor with a little research should prove to be a S19 with a 4 speed peerless tranny and a 8hp engine so good luck
I respectfully disagree. I'll look into that though. Im not unwilling to be wrong. I did get the tractor home it is an S18 from all I see preliminarily. I can only make out the CC part of the ID the front attachment was welded to the frame and covers the full number. Both the 18 and 19 did have four speed transmissions the difference was the motor. 18 was Kohler 19 was briggs. granted the engine may not be orginal I havent done much with it after getting it home, because the weather tanked.
Can you post the link your refering to in regards to the speedex info?