Tuff Torq Automatic Transaxle 7a646084181 (K46) AYP MPN 426120 OEM. Tuff Torq Automatic Transaxle 7a646084181 (K46) AYP P/N 426120 OEM. Replace fluid prior to installation. Works as it should. Pictures are used for reference only. Picture may not be the actual item received but will match description, style, and part number. Cosmetic imperfections may vary. Items marked as Grade B will be pictures of the actual item. All transaxles are tested for function. Please consult your owners manual for proper filling and air purging instructions. Attempting to operate your transaxle with out proper filling could cause damage and we will not accept your return. Check Out Our Store for More Great Products. Please reach out to us with any questions or concerns and allow 24 hours for a response excluding Weekends and Holidays. When installing part’s please take Caution. As to not cause harm to yourself or others. How to Locate the Model Number. Finding replacement parts for your lawn mower is much easier when you know the model number of your specific machine. The model number helps you match the correct parts that will fit your mower. The model and serial number information is usually printed on a label/sticker or stamped on the mower. Located in Jonesborough, TN. Listing and template services provided by inkFrog.