No problem you can put it back together again aket the band off and that will expose the brushes. there should be a hole in the brush caseing so push the brush back and insert a paper clip in the horle to hold it there I think there is 4 of them put the armature back in and take the clips out...
I forgot to say since its an overdrive you have to disconnect the wires for the solenoid and governor make sure to make where the wire go it Very important to grt them back where they belong also check to see if u can remove the hump cover for the floorboard makes getting some of the bolts out...