i have a 35 chev 3 window coupe and want to change out the alum powerglide trans with a 700r4.i was wondering if anybody out in the woods has done this. i was told that they are the same length and size and shouldnt be a big problem. i was also told that the 700 was a bit longer so i may have to ding the lower end of fire wall to get it back far enough. i probably will have to move the trans support either foreward or backward to support tran. this should not be a problem. what scares me is the chev has kind of a tunnel the rear shaft of tran fits in and i wonder if the 700 will go in this tunnel ok. if any one out there has done one let me know. it would be appreciated to say the least. no shift.