This will be behind a 235 for now. One day i might get a 261, but thats mostly just dreamin. I want to keep the original style rearend. I will be swapping it for a later style 3/4 style with Bendix brakes, but thats all. would the NV3500/4500 bolt up to an old stovebolt? Do any of these newer transmissions have granny low and overdrive? I really dont know anything about the NV's or the ZF.