Thanks for the reply's guys. I checked the owners manual and it tells how to adjust the handles for comfort and how to align the handles in the neutral position. This is the first zero turn I've driven and to go in a straight line I have to pull the right handle back about an inch compared to the left handle. I used conventional 20-50 oil when I refilled the transaxle. Should I have used synthetic? What kind of oil comes in the EZT hydro gear transaxles? Should I try purging the left transaxle? Before I reinstalled the right transaxle, I pulled the left transaxle to check the oil level. The oil level was about a half inch below the fill hole, so I added about 2 ounces of 20-50 conventional oil. In general do zero turn mowers go straight when both handles are pushed all the way forward? Thanks for reading, any help would be appreciated.