Saginaw TC has the separate reservoir and is a small, squarish little pump. Paul has the OTHER Saginaw with the integral fluid reservoir in the shape of a teardrop can on the back of the pump. Yes, you have to remove the pulley to swap out the pump (but maybe not to rebuild it). Mine was IMPOSSIBLE to pull off and in fact I broke my puller on it. So I am going to have to get a new pulley and cut the old one off before returning the used unit for the core refund. Anybody got a better idea? Torch? I tried a heat gun and lots of PBlaster: no luck.