Transmission Rebuilding 101

GotDart said

I've seen that book. Does it cover the 904 at all? Are the 727 and 904 similar enough that the information in the book is relevant?

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I dont really know the difference between the 904 and 727, only that the 904 is suposebly weaker ?
There is nothing indicates that it covers the 904, but are there any parts interchange between 904 and 727 ? Someone must know :)