The 400 I started with had the short tail. I rebuilt it using a long tailshaft and housing to be able to use a longer yoke and get more spline contact. You may want to consider this option if you feel like yours doesn't have enough spline contact.
Driveshaft contact with th400 ??
Trying to figure out the driveshaft on a 71 Chevelle 454 12bolt TH400. It is a project that didn't come with a driveshaft. I have 3 driveshafts with a Th400 Yolk on them. My question in how much contact with the tailshaft splines can I get away with? It seems any of the yolks will only go in past the seal about 2 1/2inches at most. My one diveshaft has a short yolk that seems to be the best candidate. I push the yolk all the way in raise the rear to put it in the rearend saddle and pull it back an inch to seat it in. By the time I do this I am only getting 1 and 13/16 of contact with the splines (car is hanging by the frame on jackstands). This measurement comes from 1 and 1/4 of the yolk inside the seal and 9/16 of the shaft that sticks out past the seal inside the yolk. Can I do better?
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