8 1/4 to 8 3/4 swap

dusterdon said

If the driveshaft in the 72 was good, it should be the correct length in the 73. You might have to swap the front slip yoke, I'm not sure.

don

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I believe that a 727 tranny is quite a bit longer than the 904, if that's so then the drive shaft will need to be cut plus the 727 uses a larger slip yoke so that will need to be swapped to.