Turbo 400 yoke troubles

Discussion in 'Got gears?' started by 1967 Big Buick, Dec 16, 2020.

  1. 1967 Big Buick

    1967 Big Buick One day at a time.

    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.
  2. BrianTrick

    BrianTrick Brian Trick

    Mine had the 5.5” barrel. My guess is someone got the longer one previously to try and compensate for the shorter shaft.
    With the suspension under load,and the yoke bottomed-our into the transmission,you need to be able to pull it out 1 1/4” to seat the rear u-joint into the rearend yoke.
    The other problem with some of those longer-barrel yokes is that they are not splined to the end,which doesn’t give you a lot of spline engagement if the yoke is pulled out to far.
    1967 Big Buick likes this.
  3. 1967 Big Buick

    1967 Big Buick One day at a time.

    It’s just crazy how many variables there are
    B-rock likes this.
  4. B-rock

    B-rock Well-Known Member

    You sure got that right! at times it can be overwhelming. Ordering a part becomes a second guessing war wondering if yu are doing the wrong thing.
    1967 Big Buick likes this.
  5. TrunkMonkey

    TrunkMonkey Well-Known Member

    But all those wrong parts come in handy as paper weights to hold down all the notes on the wrong parts not to order again. Yep...
    B-rock and 1967 Big Buick like this.
  6. 1967 Big Buick

    1967 Big Buick One day at a time.

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