What is a Lawn Tractor Transaxle?
A transaxle is a case that contains both the transmission components, differential and the drive axles. We generally use transaxle and transmission interchangeably when talking about todays lawn tractors because all of them use one case to house the transmission, differential and axles.
A zero-turn usually has two transaxles – one for each driving wheel.
Read more about transaxles and transmissions here: What You Need To Know Transmission Types