Well, my 4l80 took a dump on me today, I'm going to a manual and it's going to be a 6 speed. I was thinking ZF6 but I am eventually going to put a 12 valve in place of the 454 but not anytime soon so I'd like to go ahead of have the transmission for it already so have any of you guys seen a BBC to NV5600 adapter plate? Or know if it even needs one? If a NV4500 will bolt up to both a cummins and a 454, and an NV5600 will bolt to a cummins, wouldn't it bolt to the 454? I can get a NV5600 easier than a ZF6 which is why I want to use it rather than adapt the cummins to the ZF6 later on. Also, I'm not sure if the bell housing for the 5600 in the 01's and 02's is different than the 03+, if they are, please let me know, I would imaging they aren't though.