TH 400 front yolk

I am looking for a th 400 front driveshaft yolk as my driveshaft frkm my 350 doesn’t fit the tranny

 

I think i may still have one in my bin from the national's. I'll look in the morning

 

Ok thanks

 

What year 409 do u have, they used 2 different od on the yokes. As long as someone hasn't changed the extension housing the year will let you know. 67 and under take the small od, most 68 up take the larger od, splines are the same

 

Hi there
It’s a 1972 GS tranny with a BS code, does the help.
Sorry new to Buicks

 

Should be the the bigger more common size