i heard that the A500 & A518 OD Transmissions can't take any abuse at all like shifting it manually ever now a then but not everytime of course all i was wanting to do with one is possibly put a A518 behind a good 318 4bbl with a 3.23 sure grip in my 81 1/2 ton stepside truck. also i was told that there is some kind of bearing that goes out alot in the OD section of the tranny what year trannys do i need to look for and which have the lockup and non lock up converters? any help thanks