are 904 and 727 flexplates different ?

[1973challenger360]

are they different  (interchangable) ?  and I thought I read the cross members were the same, 904 to 727 and also 833 is this right ?

[Chryco Psycho]

the flex plates interchange between 9094 & 727 But there are 2 sizes larger for the 11& 12' converters & smaller for 10" = there are 2 different bolt sizes , , the 10" & smaller race convertewrs use larger 7/16" bolts instead of the factory 5/16" bolts

[1973challenger360]

thanks   CP

[Chryco Psycho]

 :thumbs:

[1973challenger360]

boy do I feel dumb, it fit.  it helps when you get the large cut out lined up.   I guess I always had then line up at first I didnt think that turning it on the splines just moves them also,   I lines up and goes on now.