biglow说的对。看下面解释

来源: ashmia 于 2015-04-08 18:04:33 [档案] [旧帖] [给我悄悄话] 阅读数 : (274 bytes)

回答: dust cap 由 biglow 于 2015-04-08 18:02:41

Many people have been confused when finding this part in their transmission. It is a plug, used in shipping the transmission. When the dipstick is pushed in, it falls into the pan. Ford elected to leave it there, they cause no harm other than to confuse folks who find them.