My collecter didn't start leaking until I took my truck to the shop to have them drop the tranny & replace that oil bypass plug in the back of the block. They had to drop the driver side exhaust down because it crosses under the trans., so they unbolted that collecter. Well they should have just cut the pipe & rewelded it because they didn't get those bolts tight enough & the gasket blew out. Then I ordered another one & replaced it. Guess what, it blew again because I couldn't get it tight enough either. So I ordered another one but I'm not gonna replace it until I know I can get it tight. The problem is those bolts are so close to the prim. tubes you can hardly get a wrench or socket on them, then add the very cramped quarters between the frame rails & the trans. & that = thoughts of homocide & suicide combined with an overwhelming urge to drive to Arkansas.