Slip yoke question?

[Bsrob]

I have a 1972 Dodge Charger S.E. with a 318 ci and im pretty sure it was a 904 auto trans. I have my 4 speed but the output shaft on it is bigger than my automatic. So i looked on brewers performance site. And Im guessing it would be a 30 spline output shaft on my 4 speed.  When i sat both automatic and manual side by side and lined up the mounts on them. The 4 speed out put shaft was prob 2 maybe 3 inches shorter. So would that mean i need to get the longer slip yoke? If no one knows would it be possible to call them and they would prob know the answer before i order one? any help at all would be much appreciated!

[RallyeMike]

The 904 slip yoke is different than the 727/833 yoke. Yes, they'll know what to send you because there is only one for your install.

[Chryco Psycho]

most 833s use the 727 yolk bu8t not all some use the smaller 904 yolk ,
Not sure ont he sline count but yes you need the large one