The THM700r4 has 4 gears 3.06, 1.63, 1.00, 0.70 overdrive, the THM200 was a 3 speed auto but very weak, The THM200-4r was a redesigned THM200 with an additional overdrive gear making it a 4 speed auto that in stock form is stronger then a 700r4 and has the benefit of a multi pattern bellhousing, ratios are 2.74, 1.57, 1.00, .67.