I've discovered its a Peerless 205-024c Tecumseh Transmission. I have to use a grease gun on it and it used Bentonite grease. Way out of my wheelhouse of knowledge but the owner's manual has spots where I'm supposed to grease it.
Does that change your thoughts on what it may be?
Whoah, I love the help. I did not expect this many responses.
1) The mower is fairly old. Google says the model is from 1999. Automatic Transmission. The forward/reverse is on one pedal.
2) I haven't changed the transmission fluid. I thought about that, but I couldn't find where to add to it...
I have a 42" Murray Riding Mower (Model 42598x92A) that runs great. I'm not super mechanically inclined but I'm handy enough. I feel confident enough until I get into the engine/transmission issues.
The engine doesn't bog down or stop ever but I sometimes lose speed and sometimes the mower...