driveshaft length

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Assuming that the auto is a 904 the lenght will be correct but you will need a new slip yoke for the front of the drive shaft. The A833 tranny has the same size output shaft as the 727 which is larger than the 904.
 
I've done a couple of 4 speed conversions and always used the 727/833 drive shaft and yoke. The 904 is a couple of inches longer.
 
I always thought the 727 tranny in an A-body was longer than the A904, A833 or 3spd manuals.
 

According to my Mopar Chassis Manual the 904 and the 833 in the a-body have the same length from engine block face to end of tail housing (well almost there is .080 difference in length) not enough to worry about.
 
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