Ok so this 1970 350GS with turbo 400 is in my shop for leaking rear seal. Cars weight is on jack stands on rear axle. I pulled driveshaft out and noticed yoke is grooved really bad, so I ordered new yoke 6.75 to match old yoke that on driveshaft. So I ordered a new one $149 Once I got yoke and new seal installed I noticed driveshaft was way to short, 53” c to c. Since I know the car needs a 55” c to c shaft I changed it out, so now my problem is, the yoke bottoms out in tranny and there’s no play in it. so my question is, was this 6.75 yoke not meant for a 70 Buick with a 55” shaft? Because I think I need the 5.5 yoke now.