Getting ready to pullout the 4-speed trans out but what is it? Bolted to the back of the Y-block bellhousing(no adapter),has 2 bolt holes on each ear(8 total),not a top loader has removable cover on drivers side(T-10 ?),found I.D. tag on front passenger side : Top row---RUG   BP  GH26  Bottem row-- D7DR  AA  1837 ? Would like to find out what the gear ratio is to compare to a T-5 to replace it with.  Does anyone remember the formula for finding out the gear ratio for the 3rd member ? I marked the top of the tire and the center of the driveshaft,turned the tire one full rotation counting the rotations of the driveshaft came up with 2 rotations of the shaft to 1 complete rotation of the tire, is this correct? What would the ratio be 2.00 to 1 (tire size 225x70x15)? Thanks for all help KID