First, I am not an expert trans guy. I just do my research, talk to the experts, and go with what looks like the best option.
When you mention the 200CR is that a typo? I think you mean a 2004R and I’ll go with that here.
Later 700R4 I believe is known at the 4L60 which, based on what I know and see is a great trans and still has the mechanical linkage vs the 4L60E which works with a ECM. I guess the case is a little smaller on the later 4L60, I think this is the one I have heard people call the “baby” 700R4 but I am not positive. I believe the 2004R is smaller than that one but not also not positive. In either case I believe you will have significantly more tunnel mods than a 200C and will need to add a new linkage and driveshaft mods, although you do get OD. I prefer the 2004R 2.74/1.57/1.0/OD vs. the 700R4. 3.06/1.62/1.0/OD with it’s tighter ratios. The 2004R can be built very strong, I think it’s lighter than the 700, and uses less HP. Although not as strong as the 700/4L60, it is plenty strong for our apps. Check out the after market trans sites for more info-Monster, Bowtie Overdrives, TCI. We chose to go with the small 200C 3 spd trans for reasons explained previously.