Hi everyone Seeing as there are so many people that ask about the V6 Crankshafts for manual conversions, i thought i would make a thread with all the crankshafts and pics of them. Anyway, this should have enough info to help everyone out, however if you have any questions just ask and i should be able to answer them for you. Ok, The below picture is of a VN V6 series 1 manual crank, it can be identified by the large 6 bolt rear flange that protudes from the block, this crank runs its own flywheel that is NOT interchangable with VN Series 2-VR & Ecotec Auto or VN series 2-VR & Ecotec Manual. This Crank can NOT be converted to auto unless you change the crank to an auto item. The below picture is a VN V6 series 1 Auto crank, it can be identified by its small 6 bolt rear flange which is flush with the rear of the block. This Crankshaft CAN be converted to Manual by way of an adaptor (that accepts the standard VN series 1 manual flywheel) or a complete custom flywheel as offered by CRS (make sure you get it balanced). You can NOT convert this crank to manual by using a standard GM flywheel without an adaptor. This is the ONLY auto crank that will not interchange auto flexplates with the later VN Series 2-VR & Ecotec cranks. The below picture is a VN Series 2-VR Crank, it can be identified by its 8 bolt rear flange that sits flush with the rear of the blocks. These cranks will all interchange both manual flywheels & auto flexplates. If you are doing an auto to manual conversion, this is by far the easiest & best one to do. The below picture is of an Ecotec & L67 crank, it can be identified by its 8 bolt rear flange crankshaft (which is the same bolt pattern as VN Series 2-VR cranks) and alloy rear main seal plate that bolts to the block. The Ecotec's & L67's will interchange manual flywheels & auto flexplates with the earlier VN Series 2-VR cranks. However, they have a different balance so if you are doing a manual conversion on an Ecotec make sure you get it mirror balanced with the auto flexplate that comes off the Ecotec (absolutely crucial on L67's). Ecotecs did come from the factory with the dual mass flywheel, but if you are doing a manual conversion on one you are better off using the earlier solid flywheel but if you do get hold of an Ecotec manual conversion it will all bolt up to your auto Ecotec. Now when it comes to manual gearbox's, the T5's are all the same from VN to VS and will all directly interchange. Hope all this helps.