See Figure 1
The Transaxle Identification Number is stamped on a boss located on the upper part of the transaxle housing. Every transaxle also carries an assembly part number, which is also required for parts ordering purposes.
On manual transaxles other than the A-520, this number is located on a metal tag attached to the front of the transaxle. On the A-520 the tag is attached to the top of the unit.
The transaxle model, assembly number, build date and final drive ratio are stamped on a tag that is attached to the top of the transaxle. Certain transaxle assemblies utilize high-strength steel in various gears to provide adequate life in heavy duty applications. The correct transaxle assembly number must be used when ordering service parts.