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Driveshaft
As you can see in the chart there is 1.78" difference between the dana and the 8 1/4.
If it has a 8 1/4 then just shorten the 1.78".
Make sure you use the proper u-joint.
The measurement [c] is taken from the housing tube center...
Difference 8 3/4 and dana
I am not sure exactly what car you are working on but, this would work for all applications.
This should give you the right length difference 8 3/4 [51.50"] and dana [50.39"] which would make the shaft 1.11" shorter with a dana. So regardless the length that would be...
318
Take a look at this.
http://www.hotrod.com/howto/113_0304_318_small_block_build/viewall.html
http://www.moparmusclemagazine.com/techarticles/mopp_0409_318_engine_build/viewall.html
Yes I'm from the old school where your word is your bond and a hand shake sealed the deal (20-30 years ago) but we are living in a world now that does't mean a whole lot anymore!!! Although there are rare occasions of this still happening...