you need a gearset. those can be pricy. you could find used. But i chose not to tackle it in my drive. i have setup many gearsets in vehicles and i understand how critical correct tools and measurements are to the longevity of the gearset. so without special tools i just bought a new drive. I still have my 1.36 drive sitting on a stand in my closet. if you like the 1.36 this one is in great working order and had the fluid changed about every other oil change. i was real easy on it. i just got another 1.5 drive that i am going to keep for a spare sooo you could possibly take this one off my hands. and i will break the drive down if you would just like the upper. best price i ever found on gears were a used set for $500.00 i have seen 1.36 gears for as low as 150.00 but also used.