does anyone know or can tell us what all this means? the rpo code is MX1 for the trans, all it says is auto trans provisioned. it looks like a th400 with bolt on yoke and 2 piece driveline, metal plate on the trans says FM -21759. other is LT9 for the RPO code, is this a truck 350 engine or passenger engine and is it a 4 bolt? some engine rebuild companys say that it could be a 2 or 4 bolt. engine casting # is 14010207. The vin says M for the engine. also RPO code says-GQ1 standard ratio- this is not a full floating axle I don't think, no extention. it is a 14 bolt 9.5 ring gear, it has M3 as a casting and CZR 060g on the axle I think it is a 3.73:1 non posi. if any of this can be answered it would appreciated. Thank you