JEFF - Welcome to The CC forum. The number you posted that's on the rearend casting is actually the casting PART number. My parts books (and Cub Cadets) are out in the shop but I think that's the casting number for ALL gear drive Cub Cadets. The rearends all use the same casting.
A #86 CC is kinda rare. It should have a small 8 HP Kohler engine, a model K181 according to the stickers on the left side of the engine when sitting on the seat.
If you can tell us if it's a gear drive, three forward & and reverse gear, or a Hydro-static transmission, infinetely variable forward & reverse, or there were a couple CC's made with a 4-speed Peerless rearend, 4-forward & a reverse. Also does it have round rear wheel fenders, or stylized 1-piece formed fenders?
All these questions help to nail down what model your CC is. Once you take the engine or HP variations and gear drive vs hydro variations out there's really only seven possible models it can be. And if you can post pictures that makes things even easier!
A #86 CC is kinda rare. It should have a small 8 HP Kohler engine, a model K181 according to the stickers on the left side of the engine when sitting on the seat.
If you can tell us if it's a gear drive, three forward & and reverse gear, or a Hydro-static transmission, infinetely variable forward & reverse, or there were a couple CC's made with a 4-speed Peerless rearend, 4-forward & a reverse. Also does it have round rear wheel fenders, or stylized 1-piece formed fenders?
All these questions help to nail down what model your CC is. Once you take the engine or HP variations and gear drive vs hydro variations out there's really only seven possible models it can be. And if you can post pictures that makes things even easier!