Bucking and jumping is behavior you would expect from a wild Mustang, not a sensible Ford Five Hundred. However, problems with the Ford Five Hundred transmission can lead to bumpy gear shifts. The Ford Five Hundred is a full-size sedan produced from 2005 to 2007. The early cars come with a choice of a ZF Batavia CFT30 CVT transmission or a six-speed Aisin F21 automatic transmission, while the updated 2007 model comes with a Ford-assembled six-speed transmission. In order to fix any shifting problems, you should consider a complete transmission rebuild or at least a replacement of the valve body, which controls the gear ratios. If you are carrying out major repairs to the transmission using Ford Five Hundred parts, be sure to update the powertrain control module and transmission control unit, which are components of the electronic control unit. A software update should go some way to preventing issues recurring in the future, especially if the vehicle has a low mileage. Browse the vast inventory on eBay for a Ford Five Hundred transmission that turns wild gear shifts into a smooth operation.Shop the extensive inventory of motors, parts, accessories, and complete auto transmissions for Ford!